Apache Solr - solr/news

Apache Solr™ 10.0.0 available

2026-03-03T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 10.0.0.

Apache Solr is the blazing-fast, open source, multi-modal search platform built on the full-text, vector, and geospatial search capabilities of Apache Lucene. Its major features include powerful full-text search, vector search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 10.0.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/docs/10_0_0/changes/Changes.html

This is a major-version release with breaking changes. The highlights below is not the full list. Please consult the "Solr Upgrade Notes" when planning an upgrade:

https://solr.apache.org/guide/solr/10_0/upgrade-notes/solr-upgrade-notes.html

Solr 10.0.0 Release Highlights:¶

Minimum Java version supported: Java 21 (or 17, for SolrJ)
Powered by Apache Lucene 10.3, with numerous small and large improvements.

Querying and Indexing¶

Significant expansion in vector search capabilities with support for scalar and binary quantized dense vectors for improved performance and reduced memory usage
cuVS-Lucene Integration: Support for cuVS-Lucene as a pluggable codec enabling GPU acceleration for vector operations.
Enhanced KNN Query Parameters: New efSearch parameter and efSearchScaleFactor for fine-tuning vector search performance
Feature Vector Caching for LTR: New caching mechanism for ranking feature vectors significantly improves performance
MergeOnFlushMergePolicy: New merge policy that optimizes indexing throughput by performing merges during flush operations rather than separately

Security¶

CLI commands now support a --credentials option to specify Basic Authentication credentials; supplementing existing solr.in.sh-based auth support.
System Property Standardization: Consistent security-related system property naming patterns improve configuration clarity and reduce misconfiguration risks
Jetty 12 upgrade provides enhanced TLS 1.3 support and modern cipher suites

Stability and Scalability¶

Apache Curator Integration: All ZooKeeper interactions are now managed through Apache Curator for improved stability and reliability.
OpenTelemetry Support: Complete migration from OpenTracing to OpenTelemetry for distributed tracing and observability.
Jetty 12 Upgrade: Major upgrade to Jetty 12 with Jakarta EE 10 namespace support.

Build and Docker¶

Updated base image to Ubuntu 24 (Noble Numbat) and improved container security

Deprecations and Removals¶

Apache HttpClient: Solr 10 standardizes the use of Jetty HttpClient internally and no longer uses Apache HttpClient.
The jaegertracer-configurator, analytics, and hadoop-auth modules have been removed.
The local Tika extraction engine has been removed. See documentation for how to use TikaServer instead.
Deprecated Field Types: Removed ExternalFileField, CurrencyField, and EnumField field types

Other¶

Introduction of an alternative, experimental Admin UI alongside the existing interface. Available at /solr/ui
LatestVersionMergePolicyFactory: Ensures index compatibility with future Solr versions during upgrade scenarios.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/10_0/upgrade-notes/solr-upgrade-notes.html

Please read CHANGELOG.md for a full list of new features, changes and bugfixes:

https://solr.apache.org/10_0_0/changes/Changes.html

Apache Solr™ 9.10.1 available

2026-01-20T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.10.1.

Solr is the blazing-fast, open source, multi-modal search platform built on Apache Lucene. It powers full-text, vector, analytics, and geospatial search at many of the world's largest organizations. Other major features include Kubernetes and docker integration, streaming, highlighting, faceting, and spellchecking.

Solr 9.10.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.10.1 Release Highlights:¶

Solr 9.10.1 contains a number of bugfixes and quality-of-life improvements, including:

Reversing a performance regression impacting "no rows" Solr queries.
Fixing an error previously triggered when sorting on spatial field types.
Preventing a deadlock that caused "hanging" / "orphaning" for distributed request threads when using ParallelHttpShardHandler

Solr 9.10.1 also includes fixes for two recently published security issues, CVE-2026-22444 and CVE-2026-22022. Administrators should either upgrade their deployments to Solr 9.10.1 to include these fixes and/or ensure that adequate remediation is in place as described in the CVE descriptions.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_10/upgrade-notes/solr-upgrade-notes.html

Please read CHANGELOG.md for a full list of bugfixes:

https://solr.apache.org/9_10_1/changes/Changes.html

Apache Solr™ 9.10.0 available

2025-11-06T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.10.0.

Solr 9.10.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.10.0 Release Highlights:¶

Java 24+ Support - Solr now runs on Java 24 and later with Security Manager disabled
External Tika Server Integration - Solr Cell can delegate document parsing to external Tika server for improved stability and scalability
Version-Based Cluster Protection - Prevents nodes with older versions from joining SolrCloud clusters
Full Outer Join Streaming - New fullOuterJoin stream function added to streaming expressions
Lucene upgraded to 9.12.3 and 30+ other dependency updates
SolrJ Dependencies - Apache HttpClient dependencies can be excluded if the legacy/deprecated SolrClients are not used.
Deprecations - XLSXResponseWriter, Tika Language Identifier, in-process Tika, and some SolrJ builders and methods in preparation for Solr 10

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_10/upgrade-notes/solr-upgrade-notes.html

Please read CHANGELOG.md for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_10_0/changes/Changes.html

Apache Solr™ 9.9.0 available

2025-07-24T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.9.0.

Solr 9.9.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.9.0 Release Highlights:¶

Solr now supports encoding text to vectors during indexing using external LLM services.
More query capabilities in Fuzzy queries and Rank queries.
Function queries can now be expressed with a numerical subset of JavaScript and access the fields and score. Powered by Lucene's Expressions module.
Solr now supports Jetty's Graceful Shutdown module (via SOLR_JETTY_GRACEFUL=true) to prevent client connections from being abruptly terminated on orderly shutdown.
PKI Auth now utilizes caching, and is much more performant for high-throughput clusters.
Optimizations in certain queries: MatchAllDocs (:), rows=0, function queries in "fl".
Numerous optimization and bug fixes for SolrJ clients.
Performance issues in ParallelHttpShardHandler have been fixed.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_9/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_9_0/changes/Changes.html

Thanks to all contributors¶

David Smiley, Houston Putman, Jason Gerlowski, Pierre Salagnac, Kevin Risden, Matthew Biscocho, hossman, Luke Kot-Zaniewski, Christine Poerschke, Siju Varghese, Rahul Goswami, Bruno Roustant, Renato Haeberli, Alessandro Benedetti, Eric Pugh, Lamine Idjeraoui, Gus Heck, Ryan Ernst, Torsten Koster, Mark Miller, Jude Muriithi, Martin Anzinger, Yura Korolov, Aparna Suresh, Alex Deparvu, Ilaria Petreti, Anna Ruggero, Uwe Schindler, Tyler Bertrand, Sanjay Dutt, Paul Blanchaert, Gaurav Tuli

Apache Solr™ 9.8.1 available

2025-03-11T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.8.1.

Solr 9.8.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.8.1 Changes:¶

Disabled the new/experimental multiThreaded=true more deeply via solr.xml's indexSearcherExecutorThreads defaulting to 0 now. It doesn't yet perform well.
Fixed wt=prometheus (metrics) format compliance issue relating to duplicate TYPE lines
Fixed LBHttp2SolrClient (in SolrCloud & SolrJ) that silently failed to complete async requests in certain scenarios. This could cause multi-sharded query requests to hang indefinitely.
Fixed a SolrCloud bug that could cause long leader elections to leave PULL replicas in DOWN state forever.
Fixed a regression from 9.x: Faceting on multi-valued EnumFieldType.
Fixed an issue in Solr sharded queries when the parameter keys only vary by case
Fixed a regression from 9.8.0: SolrCloud Replica Placement Plugins and Basic Auth could produce errors
Improved delete-by-query error message when the query parser doesn't support being used in this way (joins).
Optimization: Use less memory when a large reRankDocs parameter is provided. Was an OOM risk.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_8/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/9_8_1/changes/Changes.html

Thanks to all contributors¶

Matthew Biscocho, David Smiley, Houston Putman, Varun Thacker, Luke Kot-Zaniewski, Chris Hostetter, Thomas Wöckinger, Yue Yu, JiaBao Gao, Jason Gerlowski, Sanjay Dutt, Christine Poerschke, Jeanie Lam

Apache Solr™ 9.8.0 available

2025-01-23T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.8.0.

Solr 9.8.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.8.0 Release Highlights:¶

The Solr Cross-DC Project has graduated from the sandbox repository into the Solr project as a supported capability.
Requests can specify the 'memAllowed' parameter to halt requests that have exceeded this amount of memory (similar to timeAllowed but for memory).
New knn_text_to_vector query parser that encodes query text into a vector (AKA "embedding") via external LLM services.
New ParallelHttpShardHandlerFactory for reducing distributed-search latency in collections with many shards. This is not used by default.
Cluster properties can now be listed or read individually using new v2 APIs ("GET /api/cluster/properties" and "GET /api/cluster/properties/propName")
SolrJ CloudSolrClient now performs reasonably when configured with Solr URLs, which is increasingly going to be preferred over ZK URLs. Some big performance improvements occurred this release.
Shard splits now support indexes with nested documents.
"<lib\>" tags in solrconfig.xml are now quietly ignored by default unless explicitly enabled with the SOLR_CONFIG_LIB_ENABLED=true environment variable (or corresponding sysprop)
multiThreaded=true no longer risks rejected exceptions under load. But you may need to increase the thread pool to more fully utilize a machine than previously.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://github.com/apache/solr/blob/main/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc#solr-98

Please read CHANGES.txt for a full list of new features, changes and bug-fixes:

https://solr.apache.org/9_8_0/changes/Changes.html

Thanks to all contributors¶

David Smiley, Eric Pugh, Jason Gerlowski, Houston Putman, Sanjay Dutt, Andrzej Bialecki, Christos Malliaridis, Aparna Suresh, Pierre Salagnac, Gus Heck, hossman, Rahul Goswami, Jan Høydahl, Bruno Roustant, Uwe Schindler, Mark Miller, Alessandro Benedetti, Tim Owens, Carlos Ugarte, Matthew Biscocho, shalin, Paul McArthur, Mathieu Marie, Haythem Khiri, James Dyer, Zack Kendall, Shawn Heisey, Stephen Zhou, Christine Poerschke, Alexander Zagniotov, Martin Anzinger, Peter Kroiss, Andrey Bozhko, Anshum Gupta

Solr 8 reaches End-Of-Life

2024-10-25T00:00:00+00:00

With Lucene 10 having been released, and therefore Lucene 8 reaching EOL, the Apache Lucene and Solr PMCs are no longer able to provide new releases for Solr 8. Solr 8.11.4 will be the last release of Solr 8.

Users are strongly recommended to upgrade to Solr 9, and prepare for the soon-to-be-released Solr 10.

Apache Solr™ 8.11.4 available

2024-09-24T00:00:00+00:00

The Lucene and Solr PMCs are pleased to announce the release of Apache Solr 8.11.4.

Solr is the blazing-fast, open source, multi-modal search platform built on Apache Lucene. It powers full-text, analytics, and geospatial search at many of the world's largest organizations. Other major features include Kubernetes and docker integration, streaming, highlighting, faceting, and spellchecking.

Solr 8.11.4 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.11.4 Release Highlights:¶

ConfigSets created during a backup restore command are no longer trusted implicitly
Removed the ability to bypass authentication using a fake URL path ending
The jetty-transport-classes-epoll jar has been added to the server lib directory

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_11/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/docs/8_11_4/changes/Changes.html

Solr 8.11.4 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_11_4/changes/Changes.html

Apache Solr™ 9.7.0 available

2024-09-09T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.7.0.

The release is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.7.0 Release Highlights¶

DocValues enabled by default - Most fields/fieldTypes that support docValues will have them enabled by default in the latest schema version 1.7. This does not affect users who upgrade to this Solr version without updating their schema version.
New "vectorSimilarity" QParser for matching documents based on a minimum vector similarity threshold
Prometheus formatted metrics can now be exposed directly by Solr via ‘wt=prometheus’. There were improvements to the Prometheus Exporter as well.
Limits / guard-rails for short prefix queries and for too many fields.
Authentication improvements for the "MultiAuth" plugin. And the Subquery transformer now support basic auth.
Solr CLI adopts "kebab" formatting for long options. For example "-solrURL" becomes "--solr-url". Previous style commands continue to be supported in 9x and will be removed in 10x.
Solr CLI now supports all the ZooKeeper related operations that required the use of "zkcli.sh" including linkconfig, cluster, and updateacls commands.

Performance improvements:

Opt-in multithreaded search execution- Users can enable concurrent segment searching for reduced latency
Apache Lucene upgraded to 9.11.1 introducing tremendous performance improvements when using Java 21 for vector search among other things.
On Linux and Mac platforms with Java 21, MMapDirectory will now also use POSIX madvise for better paging and read-ahead of index files.
Reduced heap usage especially for high-core-count, high-field-count, high-thread-count cases for stored fields.
Async backup/restore and other operations scale to 100+ shards via tweaks to core asyncId caching.

There were more changes and details to read; that was just an editorialized summary.

Read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/docs/9_7_0/changes/Changes.html

When upgrading, always read the upgrade notes:

https://github.com/apache/solr/blob/main/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc#solr-97

Thanks to all contributors:

David Smiley, Eric Pugh, Jason Gerlowski, hossman, Houston Putman, Pierre Salagnac, Christine Poerschke, Christos Malliaridis, Michael Gibney, Sanjay Dutt, Yohann Callea, janhoy, Liu Huajin, Andrey Bozhko, Lamine Idjeraoui, Ishan Chattopadhyaya, Mark Miller, noble, Gus Heck, Matthew Biscocho, Alexey Serba, Rafał Harabień, Eivind Bergstøl, Calvin Smith, Tomás Fernández Löbbe, @charlygrappa, Alastair Porter, ellaeln, Patson Luk, Vinayak Hegde, Kevin Risden, Rudy Seitz, @hgdharold, Bostoi, Torsten Bøgh Köster, Hakan Özler, Andy Webb, Stephen Woods, Anshum Gupta

Apache Solr™ 9.6.1 available

2024-05-29T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.6.1.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Solr project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 9.6.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.6.1 Release Highlights:¶

Core loading at startup is no longer capped at 60 seconds
Replicas are ensured to be marked as down when a Solr node is started
'Illegal character in query' exception in the new HttpJdkSolrClient has been fixed
Performance regression for aliases in SolrJ has been fixed via partially reverting a recent change
Fixed debugging of Rerank Queries when reRankScale is used
System file separator is now used in CachingDirectoryFactory, instead of '/', fixing a regression on Windows

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_6/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/9_6_1/changes/Changes.html

Thanks to all contributors!

hossman, Houston Putman, Jan Høydahl, Andy Webb, Christine Poerschke, Aparna Suresh, David Smiley, Vincent Primault

Apache Solr™ 9.6.0 available

2024-04-27T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.6.0.

Solr 9.6.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.6.0 Release Highlights:¶

Solrj now offers a lightweight client based on java.net.http.HttpClient: HttpJdkSolrClient
SolrJ now offers an improved async request API
Inactive shards (from splits) can now be cleaned up periodically
Distributed (sharded) IDF can be disabled via request parameter
Query timeouts (limits) may now be based on either CPU time as well as wall clock
Upgraded Lucene to 9.10.0
bin/solr post now supports --dry-run mode.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_6/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_6_0/changes/Changes.html

Thanks to all contributors!

hossman, David Smiley, Michael Gibney, Paul McArthur, Jan Høydahl, James Dyer, Eric Pugh, Andrey Bozhko, Andrzej Bialecki, Rahul Goswami, Bruno Roustant, Jason Gerlowski, Sanjay Dutt, Vincent Primault, Christine Poerschke, Gus Heck, Shawn Heisey, Vincenzo D'Amore, Yohann Callea, Julien Pilourdault, Wei Wang, Mikhail Khludnev, Antoine Bursaux, Rishi Sankar, Pierre Salagnac, Aparna Suresh, Alessandro Benedetti, Mathieu Marie, Przemyslaw Ciezkowski

Apache Solr™ 9.5.0 available

2024-02-12T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.5.0.

Solr 9.5.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.5.0 Release Highlights:¶

Solr now supports "node-level" Memory and CPU circuit breakers, that serve as a default inherited by all cores on that node.
Collection and Replica Properties may now be used as property substitution variables in configuration files (e.g. solrconfig.xml).
Solr now auto-reloads updated keystore and truststore files when TLS is enabled.
Tracing support has received a number of quality-of-life improvements, including improved tracking of distributed collection commands and increased coverage for internal requests made with the Apache and Jetty HTTP clients.
Solr now offers the <clusterSingleton> solr.xml tag as a means of configuring node-level plugins in an "immutable infrastructure"-friendly way. This offers an alternative to using the /cluster/plugins API for managing plugins in "live" clusters.
Starting with 9.5.0, Solr releases now produce an OpenAPI specification covering many of their v2 APIs. Consumers may use this spec with an array of OpenAPI-compatible tooling to generate documentation, clients in various programming languages, etc. See https://www.openapis.org/what-is-openapi for more details.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_5/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_5_0/changes/Changes.html

Apache Solr™ 8.11.3 available

2024-02-08T00:00:00+00:00

The Lucene and Solr PMCs are pleased to announce the release of Apache Solr 8.11.3.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 8.11.3 is available for immediate download at:

https://lucene.apache.org/solr/downloads.html

Solr 8.11.3 Release Highlights:¶

Security¶

Converted enableRemoteStreaming and enableStreamBody solrconfig options into system properties and env vars.
Restrict certain file types from being uploaded to or downloaded from Config Sets
ZK Credentials and ACLs are no longer sent to all ZK Servers when using Streaming Expressions. They will only be used when sent to the default ZK Host.
Schema Designer now correctly manages trust of the ConfigSets it is managing.
More sysProps are redacted in the UI by default.
Upgrades of various client libraries, including Jetty, Tika, Netty and Calcite.

Bugfixes¶

TLOGs on TLOG replicas no longer grow continuously.
Various fixes for clusters using PRS.
Collection RENAME api no longer creates broken alias.
Using Schema/Config API no longer breaks the File-Upload of Config Set File.
Fixed NPE in FieldLengthFeature with non-stored/missing fields.
HEAD request for managed resource no longer returns 500 Server Error.

Features¶

AWS STS support has been added for the s3-repository module.
Node roles and dedicated query coordinator nodes have been added.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_11/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/docs/8_11_3/changes/Changes.html

Solr 8.11.3 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_11_3/changes/Changes.html

Apache Solr™ 9.4.1 available

2024-01-18T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.4.1.

Solr 9.4.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.4.1 Release Highlights:¶

A big regression to the JSON Query API in 9.4 is primarily what prompted this release. Additionally, some security oriented improvements/fixes have been added, and many transitive dependencies have been upgraded.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_4/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/9_4_1/changes/Changes.html

Apache Solr™ 9.4.0 available

2023-10-15T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.4.0.

Solr 9.4.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.4.0 Release Highlights:¶

The Lucene version used by Solr has been upgraded to 9.8 – see its release notes.
The Jetty version has been updated to 10.0.17 to address CVE-2023-44487
Added support for node-level caches
Circuit Breakers available for Update Requests
A new Circuit breaker for percentage of CPU utilization is added. The former "CPU" circuit breaker is now more correctly named LoadAverageCircuitBreaker as it trips on system load average which is not a percentage.
Solr now includes an always-on trace id generator. This will inject trace id headers for every Solr request, propagating the client supplied value or generating a new id as needed and replaces the existing rid mechanism.
Solr now limits the number of concurrent expensive core operations (such as "backup", "restore", and "split") that are submitted asynchronously by running them in a dedicated thread pool.
Added support of OAuth 2.0/OIDC 'code with PKCE' flow
Multiple bug fixes for TLS and mTLS

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_4/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_4_0/changes/Changes.html

Apache Solr™ 9.3.0 available

2023-07-21T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.3.0.

Solr 9.3.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.3.0 Release Highlights:¶

The Lucene version used by Solr has been upgraded to 9.7.
Solr releases now have a slim variant, both for the binary release and the docker image.
- The Slim variant is the same as the normal variant, except that it does not include Solr modules or the Prometheus exporter.
Vector Search
- Added support for byte vector encoding in DenseVectorField and KnnQParser
- High dimensional vectors are now supported in Solr
- Solr can now take advantage of SIMD optimizations for Vector calculations, when run with Java 20 or 21.
- A new "vectorSimilarity" function query has been added to calculate similarity scores for DenseVectorFields
Solr now provides an "Install Shard" API to allow users who have built (per-shard) indices offline to import them into SolrCloud shards.
Solr’s experimental "v2" API has seen a number of improvements in the 9.3 release.
- It is now approaching parity with the functionality offered by Solr’s v1 API.
- The v2 API as a whole is being redesigned to be more REST-ful and intuitive
  See the Changelog and upgrade notes for information on which v2 APIs have backward-incompatible changes.
New APIs for MigrateReplicas and BalanceReplicas. These work out-of-the-box with the built-in PlacementPlugins.
- The AffinityPlacementPlugin now supports co-location of shards between collections, using the "withCollectionShards" parameter.
Join Queries may handle equally sharded collections on both sides.
- Collections shards should be collocated via AffinityPlacementPlugin.withCollectionShards
- This operation doesn't support SplitShard
Unknown cores are no longer deleted by default when Solr starts. Use "solr.deleteUnknownCores=true" to use the previous behavior.
Warning: Solr cannot be used with Java 20 on MacOS with the Java Security Manager.
Please use the environment variable SOLR_SECURITY_MANAGER_ENABLED=false when running with Java 20 on MacOS.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_3/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_3_0/changes/Changes.html

Apache Solr™ 9.2.1 available

2023-05-01T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.2.1.

Solr 9.2.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.2.1 Release Highlights:¶

Fix Classloading Exception for inter-node requests when using SSL and HTTP2
Use the right cluster property for displaying if TLS is enabled
Fix NPE in SystemInfoHandler for inter-node requests that would cause the Nodes page not to load
Fixing bin/solr's '-noprompt' option to work for examples
Allow custom configuration of Jetty's SecureRequestCustomizer
Fix KerberosPlugin module classloading when using the hadoop-auth module
Fixing SOLR_DATA_HOME to be honored outside of verbose mode
Use the correct instance of ReponseParser for Http2SolrClient.processErrorsAndResponse
Fix Java version detection when _JAVA_OPTIONS is set`

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_2/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/9_2_1/changes/Changes.html

Apache Solr™ 9.2.0 available

2023-03-24T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.2.0.

Solr 9.2.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.2.0 Release Highlights:¶

Solr has upgraded to use Jetty 10 instead of Jetty 9.
Solr now includes an opentracing module, with support for OTEL tracing in OTLP format using gRPC.
- This module is meant to replace the jaegertracer-configurator module, which has been deprecated.
The base operating system of the Solr Docker image has been upgraded to Ubuntu 22 (Jammy).
Streaming Expressions have been moved out of Solrj core into its own module called solrj-streaming.
SolrJ Solr clients now use a builder/setter pattern to enable easier setup.
Solr ConfigSet management has been optimized to improve the startup time of nodes with multiple replicas.
SolrJ can again be used with the default Java truststore.
The "Films" example has been updated to demonstrate Dense Vector search.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_2/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_2_0/changes/Changes.html

Apache Solr™ 9.1.1 available

2023-01-25T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.1.1.

Solr 9.1.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.1.1 Release Highlights:¶

Bugfixes

SOLR-16589: Fixed issue where large fields with large=true could be truncated when using unicode values
SOLR-16585: Fixed NPE when paginating MatchAllDocs with non-zero start offset, like q=*:*&start=10
SOLR-16165: Fixed rare deadlock in SlotAcc static initialization
SOLR-16622: Fixed issue where replicas could fail to register as active after node restart

Other

SOLR-16443: Upgrade Jackson bom to 2.13.4.20221013
SOLR-16568: Upgrade woodstox-core to 6.4.0
SOLR-16598: Upgrade Protobuf to 3.21.12
SOLR-16567: Fixed problem with filtering and KNN search, especially when using post-filters
SOLR-16588: Fixed problem with default knn algorithm
SOLR-16480: ConfigSets now have an overridable allow-list for filetypes

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_1/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/9_1_1/changes/Changes.html

Apache Solr™ 9.1.0 available

2022-11-17T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.1.0.

Solr 9.1.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 9.1.0 Release Highlights:¶

Dedicated query coordinator nodes in a Solr cluster
Improvements to admin UI: managing paramsets in queries, managing field types, replica types while collection creation, etc.
Support for rolling up core level metrics to be node level metrics

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/solr/9_1/upgrade-notes/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_1_0/changes/Changes.html

Java 17 bug affecting Solr

2022-10-21T00:00:00+00:00

Several users running Solr in production on OpenJDK 17 have experienced JVM crashes due to a known bug in the JDK. Read more about the bug in SOLR-16463.

Known mitigations are to either downgrade to JDK 11 or to start Solr with a Java startup flag that avoids the failure condition. Here is how to manually apply the flag:

Edit your solr.in.sh or solr.in.cmd file to set the SOLR_OPTS environment variable as follows:

Linux:

SOLR_OPTS=-XX:CompileCommand=exclude,com.github.benmanes.caffeine.cache.BoundedLocalCache::put

Windows:

SET SOLR_OPTS=-XX:CompileCommand=exclude,com.github.benmanes.caffeine.cache.BoundedLocalCache::put

Alternatively, you can inject the same flag with the -a argument, e.g:

bin/solr -a "-XX:CompileCommand=exclude,com.github.benmanes.caffeine.cache.BoundedLocalCache::put"

If you run Solr 9 with the official Docker image, we have already pushed an updated Docker image to Docker Hub that will inject the flag for you. Just pull the image again to get it. The Docker image uses the -a option to set this java flag when running Solr, so if you are using the -a option you will need to provide the JVM flag mentioned above in addition to the other flags you are setting.

Solr 8 Docker image changes to Eclipse Temurin JDK

2022-10-20T00:00:00+00:00

The official docker image for Solr 8.11 has been running on Oracle OpenJDK 11 JRE. However, due to Oracle's new release policies, they now no longer provide support for JDK11. Since Solr 8.11 is still being supported by the Apache Solr project, we needed to switch to another OpenJDK vendor with JDK11 support. We chose Eclipse Temurin from the Adoptium project. This is the same vendor as we use for our Solr 9 image, and their JDK11 support lasts until October 2024.

Users should be aware that on your next docker pull solr:8.11.2 you will be upgraded. For most users there will be no issues, as it is mainly a new distribution of the same upstream OpenJDK version. However, if you use our image as base image and rely on specific tools to be present, you may need to adapt. While openjdk:11-jre uses Debian GNU/Linux 11 (bullseye), the eclipse-temurin:11-jre-focal image uses Ubuntu 20.04.5 LTS (Focal Fossa).

Furthermore, there is now no difference between the solr:11-jre and solr:11-jre-slim images, because our new vendor only offers one variant which is fairly slim already.

Solr Docker images now pin the Linux release

2022-10-20T00:00:00+00:00

Solr 9 was released on May 12th, using the eclipse-temurin:17-jre base image. Thus, we are pinned to Java 17 and Solr's Docker image will thus always use an updated Java 17 version. If you pull the docker image from time to time that is.

However, the base image tag 17-jre did not give us pinning to a specific Ubuntu Linux major release. At the time of Solr 9 release on May 12th it would pull Ubuntu 20.04 (Focal Fossa), but at the end of May, it was auto upgraded to the brand new Ubuntu 22.04 (Jammy Jellyfish). This was not our desire, and we have learnt that due to this, our image is no longer compatible with Docker client versions before 20.10.16. Having a "floating" linux release like this can also break the image in other subtle ways, as well as breaking downstream images using us as a base image.

We therefore decided to start pinning not only Java release, but also Linux release in our official Docker images. This means that Solr 9.0 is once again based on Ubuntu 20.04 Focal, i.e. a downgrade.

Note that our images will still receive important Linux bug fixes from time to time, but you won't get them unless you re-pull the image. When we upgrade to Ubuntu 22.04 in the future, it will be a deliberate decision and not by accident.

Apache Solr™ 8.11.2 available

2022-06-17T00:00:00+00:00

The Lucene and Solr PMCs are pleased to announce the release of Apache Solr 8.11.2.

Solr 8.11.2 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.11.2 Release Highlights:¶

Security

SOLR-15871: Update Log4J to 2.17.1
SOLR-15961: Fix bug in PKIAuthenticationPlugin that can cause a request to fail with 401 Unauthorized instead of re-fetching expired remote keys from other nodes.
SOLR-14569: Configuring a shardHandlerFactory on the /select requestHandler results in HTTP 401 when searching on alias in secured Solr.
SOLR-16022: Enforce special character requirements on passwords with length less than 15
SOLR-16075: ShowFileHandler path parameter is now validated to be relative to instance conf dir in standalone mode

Bugfixes

SOLR-15849: Fix the connection reset problem caused by the incorrect use of 4LW with \n when monitoring zooKeeper status
SOLR-16199: Improve query syntax construction for SQL LIKE clause with phrases and wildcards
SOLR-16143: SolrConfig can miss updates from ZooKeeper when deleting and recreating file items

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_11/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/docs/8_11_2/changes/Changes.html

Solr 8.11.2 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_11_2/changes/Changes.html

Apache Solr™ 9.0.0 available

2022-05-12T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 9.0.0.

Solr 9.0.0 is available for immediate download at:

https://solr.apache.org/downloads.html

This is a major-version release with breaking changes. The highlights below is not the full list. Please consult the "Solr Upgrade Notes" when planning an upgrade:

https://solr.apache.org/guide/solr/9_0/upgrade-notes/solr-upgrade-notes.html

Solr 9.0.0 Release Highlights:¶

Minimum Java version supported: Java 11
Powered by Lucene 9.0, with numerous small and large improvements, such as smaller index footprint.

Querying and Indexing¶

Dense Vector "Neural" Search through DenseVectorField fieldType and K-Nearest-Neighbor (KNN) Query Parser.
Admin UI support for SQL Querying.
New snowball stemmers: Hindi, Indonesian, Nepali, Serbian, Tamil, and Yiddish.
New NorwegianNormalizationFilter.

Security¶

Certificate Authentication Plugin lets you authenticate with x509 client certificates.
Upgrade to Zookeeper 3.7, allowing for TLS protected ZK communication.
All request handlers support security permissions for authorization.
Solr now runs with the Java security manager enabled by default.
Solr embedded zookeeper only binds to localhost by default.
A lot of dependency updates make Solr much more secure.

Stability and Scalability¶

Rate limiting provides a way to throttle update and search requests based on usage metrics.
Task management interface allows declaring tasks as cancellable and trackable.
Ability to specify node roles in Solr. This release supports 'Overseer' and 'Data' roles.
Support for distributed processing of cluster state updates and collection API calls without relying on the Overseer.

Build and Docker¶

Solr is now built and released independently of Apache Lucene (separate Apache projects).
Build system switched to Gradle from Ant + Ivy.
Docker image creation is now a part of the Apache Solr Github repo.
Docker image documentation is now a part of the reference guide.
Official Docker image upgraded to use JDK17 (by Eclipse Temurin) and ability to create a local image that is functionally identical to the official one.

Deprecations and Removals¶

The Data Import Handler (DIH) is an independent project now; it is no longer a part of Solr.
No more support for clusterstate.json and MIGRATESTATE API has been removed. If your collections use clusterstate.json, please refer to the Upgrade Notes.
Auto scaling framework has been removed. Please refer to the new Replica Placement Plugins for alternate options.
LegacyBM25SimilarityFactory has been removed.
VelocityResponseWriter is an independent project now; it is no longer a part of Solr. This encompasses all previously included /browse and wt=velocity examples.
Legacy SolrCache implementations (LRUCache, LFUCache, FastLRUCache) have been removed. Users should modify their existing configurations to use CaffeineCache instead.
Cross Data Center Replication has been removed.
SolrJ clients like HttpSolrClient and LBHttpSolrClient that lacked HTTP2 support have been deprecated. The old CloudSolrClient has been renamed as CloudLegacySolrClient and deprecated.
SimpleFSDirectoryFactory is removed in favor of NIOFSDirectoryFactory.

Other¶

Contrib modules are now just "modules". You can easily enable module(s) through environment variable SOLR_MODULES.
Features lifted out as separate modules are: HDFS, Hadoop-Auth, SQL, Scripting, and JWT-Auth.
The "dist" folder in the release is gone. Module jars are now inside respective module's lib/ folder.
SolrJ class CloudSolrClient now supports HTTP2. It has a new Builder. See CloudLegacySolrClient for the 8.x version of this class
Jetty Request log is now enabled by default, i.e. logging every request.

Please read CHANGES.txt for a full list of new features, changes and bugfixes:

https://solr.apache.org/9_0_0/changes/Changes.html

Apache Solr™ 8.11.1 available

2021-12-16T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.11.1.

Solr 8.11.1 is available for immediate download at:

https://lucene.apache.org/solr/downloads.html

Solr 8.11.1 Release Highlights:¶

Security

Updates bundled log4j2 dependencies to address CVE-2021-44228 (SOLR-15843)
Upgrade jaegertracing to 1.6.0 and libthrift to 0.14.1 to address CVE-2020-13949 (SOLR-15324)

Bugfixes

Fixes to the new Admin UI Security and Schema Designer screens (SOLR-15825, SOLR-15774 and SOLR-15813)
Fix regression in 8.11.0 for the Admin UI Files screen and Velocity (SOLR-15804)
Admin endpoints for Zookeeper now by default protected by zk_read permission (SOLR-15768)
Better default security.json uploaded by bin/solr tool (SOLR-15828)
Switching a PRS collection from true -> false -> true resulted in INACTIVE replicas (SOLR-15794)
Fix REPLACENODE to not use source node when choosing a target node (SOLR-15795)
Fix NPE in pivot facets, add non-Analyzed query method in FieldType (SOLR-8319)
Upgrade Velocity from to v2.3 and Velocity Tools to v3.1 (SOLR-15844)
..and more

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_11/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/docs/8_11_1/changes/Changes.html

Apache Solr™ 8.11.0 available

2021-11-16T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 8.11.0.

Solr 8.11.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.11.0 Release Highlights:¶

Security¶

MultiAuthPlugin (for authentication) and MultiAuthRuleBasedAuthorizationPlugin (for authorization) classes to support multiple authentication schemes, such as Bearer and Basic. This allows the Admin UI to use OIDC (JWTAuthPlugin) to authenticate users while still supporting Basic authentication for command-line tools and the Prometheus exporter.

A summary of important changes is published in the Solr Reference Guide at https://solr.apache.org/guide/8_11/solr-upgrade-notes.html.

For the most exhaustive list, see the full release notes at https://solr.apache.org/8_11_0/changes/Changes.html or by viewing the CHANGES.txt file accompanying the distribution.

Solr's release notes usually don't include Lucene layer changes. Lucene's release notes are at https://lucene.apache.org/core/8_11_0/changes/Changes.html

Apache Solr™ 8.10.1 available

2021-10-18T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 8.10.1.

Solr 8.10.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.10.1 Release Highlights:¶

Dependencies upgrades¶

Upgrade httpclient and httpmime to 4.5.13 (SOLR-15269)
Upgrade the following dependencies with vulnerabilities (SOLR-15677)
jetty: 9.4.44.v20210927
tika: 1.27
commons-compress: 1.21
netty: 4.1.68.Final
fasterxml.jackson: 2.12.3
errorprone: 2.9.0
gcp-client: 1.32.1

A summary of important changes is published in the Solr Reference Guide at https://solr.apache.org/guide/8_10_1/solr-upgrade-notes.html.

For the most exhaustive list, see the full release notes at https://solr.apache.org/8_10_1/changes/Changes.html or by viewing the CHANGES.txt file accompanying the distribution.

Solr's release notes usually don't include Lucene layer changes. Lucene's release notes are at https://lucene.apache.org/core/8_10_1/changes/Changes.html

Apache Solr™ 8.10.0 available

2021-09-27T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 8.10.0.

Solr 8.10.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.10.0 Release Highlights:¶

Backup / Restore¶

Backup / restore to / from Amazon S3 (SOLR-15089); included upgrading the AWS SDK to v2 (SOLR-15599)

Schema Designer UI¶

A new Admin UI screen to interactively design your Solr schema and supporting ConfigSet files from sample data (SOLR-15277)

Security UI¶

A new Admin UI screen to manage users, roles, and permissions (SOLR-15527)

SQL Improvements¶

Several enhancements and bug fixes for Solr's Parallel SQL interface, included upgrading Apache Calcite to 1.27.0 (SOLR-15460, SOLR-15451, SOLR-15456, SOLR-15461, SOLR-15489, SOLR-15475, SOLR-15499, SOLR-15570, SOLR-15576, SOLR-9853, SOLR-15579, SOLR-15566)

A summary of important changes is published in the Solr Reference Guide at https://solr.apache.org/guide/8_10/solr-upgrade-notes.html.

For the most exhaustive list, see the full release notes at https://solr.apache.org/8_10_0/changes/Changes.html or by viewing the CHANGES.txt file accompanying the distribution.

Solr's release notes usually don't include Lucene layer changes. Lucene's release notes are at https://lucene.apache.org/core/8_10_0/changes/Changes.html

Apache Solr™ 8.9.0 available

2021-06-16T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 8.9.0.

Solr 8.9.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.9.0 Release Highlights:¶

Backup/Restore: Support for incremental backups, support for storing backups in Google Cloud Storage (GCS), ability to restore on top of an existing collection. Improved v2 API. Please see CHANGES.txt for details. (SOLR-15087, SOLR-15090, SOLR-13608, SOLR-15101)
Monitoring: New "Solr Cluster" row in Grafana dashboard, improved Zookeeper monitoring, new shard health info in CLUSTERSTATUS and more. Please see CHANGES.txt for details. (SOLR-15365, SOLR-15397, SOLR-15300, SOLR-15081, SOLR-15383)
Deprecations: The Metrics history feature has been deprecated and will be removed in 9.0 (SOLR-15416)
Admin UI: Query page now stores state in URL and can easily be shared (SOLR-6152)
Security: Jetty server upgraded to 9.4.41 which fixes some known vulnerabilities (SOLR-15316)

A summary of important changes is published in the Solr Reference Guide at https://solr.apache.org/guide/8_9/solr-upgrade-notes.html.

For the most exhaustive list, see the full release notes at https://solr.apache.org/8_9_0/changes/Changes.html or by viewing the CHANGES.txt file accompanying the distribution.

Solr's release notes usually don't include Lucene layer changes. Lucene's release notes are at https://lucene.apache.org/core/8_9_0/changes/Changes.html

Apache Solr™ 8.8.2 available

2021-04-12T00:00:00+00:00

The Solr PMC is pleased to announce the release of Apache Solr 8.8.2.

Solr 8.8.2 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.8.2 Release Highlights:¶

SOLR-15249: Properly set ZK ACLs on /security.json
SOLR-15233: Set doAs param in ConfigurableInternodeAuthHadoopPlugin
SOLR-15217: Use shardsWhitelist in ReplicationHandler
SOLR-15288: Hardening NODEDOWN event in collections using PerReplicaStates

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_8/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/8_8_2/changes/Changes.html

Solr 8.8.2 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_8_2/changes/Changes.html

Apache Solr™ 8.8.1 available

2021-02-22T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.8.1.

Solr 8.8.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.8.1 Release Highlights:¶

Fix for a SolrJ backwards compatibility issue when upgrading the server to 8.8.0 without upgrading SolrJ to 8.8.0. Users are encouraged to use 8.8.1 instead of 8.8.0.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_8/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/8_8_1/changes/Changes.html

Solr 8.8.1 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_8_1/changes/Changes.html

Apache Solr becomes an Apache TLP

2021-02-17T00:00:00+00:00

The Apache Software Foundation's board today established Solr as a Top Level Project (TLP). Solr has been a Lucene sub-project since its incubation in 2006, governed by the Lucene PMC, and has since the 3.1 release also shared source code repository with Lucene.

What's the background?¶

The change was proposed by members of the Lucene PMC, and a vote in June 2020 decided that Solr would be a separate TLP. Later, the Lucene PMC decided that the Solr project would be bootstrapped with the same set of committers and PMC members as the "mother" Lucene project.

How does this affect users?¶

The Solr software will not change at all as a result of this, but users will see these changes:

Solr gets a new website at solr.apache.org
Solr gets a new download location in the mirrors
The email address of the users mailing-list will change, but subscribers will be moved automatically

How does this affect developers?¶

Developers will have to do a number of things to adapt to the change

Subscribe to the new mailing lists. See Mailing Lists & Chat for instructions
Start using the new git location by cloning or defining a new git remote
Realize that lucene will be a build dependency of Solr on the main branch (once the code migration is done)
Backported bug fixes for Solr 8.8 must be submitted to the Lucene git, for a joint bugfix release

NOTE: Some things may be in flux during the migration work.

Apache Solr™ 8.8.0 available

2021-01-29T00:00:00+00:00

29/01/2021, Apache Solr™ 8.8 available The Lucene PMC is pleased to announce the release of Apache Solr 8.8

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

The release is available for immediate download at:

https://solr.apache.org/downloads.html

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/8_8_0/changes/Changes.html

Solr 8.8.0 Release Highlights

Reducing overseer bottlenecks using per-replica states. More stability and lesser load on large cluster that use this feauture. Better restart and collection creation performance

Interleaving support in Learning To Rank

A summary of important changes is published in the Solr Reference Guide at https://solr.apache.org/guide/8_8/solr-upgrade-notes.html. For the most exhaustive list, see the full release notes at https://solr.apache.org/8_8_0/changes/Changes.html or by viewing the CHANGES.txt file accompanying the distribution. Solr's release notes usually don't include Lucene layer changes. Lucene's release notes are at https://lucene.apache.org/core/8_8_0/changes/Changes.html

Apache Solr™ 8.7.0 available

2020-11-03T00:00:00+00:00

3/11/2020, Apache Solr™ 8.7 available The Lucene PMC is pleased to announce the release of Apache Solr 8.7

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

The release is available for immediate download at:

https://solr.apache.org/downloads.html

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/8_7_0/changes/Changes.html

Solr 8.7.0 Release Highlights

SOLR-14588 -- Circuit Breakers Infrastructure and Real JVM Based Circuit Breaker

SOLR-14615 –- CPU Based Circuit Breaker

SOLR-14537 -- Improve performance of ExportWriter

SOLR-14651 -- The MetricsHistoryHandler Can Be Disabled

A summary of important changes is published in the Solr Reference Guide at https://solr.apache.org/guide/8_7/solr-upgrade-notes.html. For the most exhaustive list, see the full release notes at https://solr.apache.org/8_7_0/changes/Changes.html or by viewing the CHANGES.txt file accompanying the distribution. Solr's release notes usually don't include Lucene layer changes. Lucene's release notes are at https://lucene.apache.org/core/8_7_0/changes/Changes.html

Apache Solr™ 8.6.3 available

2020-10-07T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.6.3.

Solr 8.6.3 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.6.3 Release Highlights:¶

SOLR-14898: Prevent duplicate header accumulation on internally forwarded requests
SOLR-14768: Fix HTTP multipart POST requests to Solr (8.6.0 regression)
SOLR-14859: PrefixTree-based fields now reject invalid schema properties instead of quietly failing certain queries
SOLR-14663: CREATE ConfigSet action now copies base node content

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_6/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/8_6_3/changes/Changes.html

Solr 8.6.3 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_6_3/changes/Changes.html

Apache Solr™ 8.6.2 available

2020-09-01T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.6.2.

Solr 8.6.2 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.6.2 Bug Fixes:¶

SOLR-14751: Zookeeper Admin screen not working for old ZK versions.

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_6/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/8_6_2/changes/Changes.html

Solr 8.6.2 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_6_2/changes/Changes.html

Apache Solr™ 8.6.1 available

2020-08-13T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.6.1.

Solr 8.6.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.6.1 Release Highlights:¶

SOLR-14665: Revert SOLR-12845 adding of default autoscaling cluster policy, due to performance issues
SOLR-14671: Parsing dynamic ZK config sometimes cause NumberFormatException

Please refer to the Upgrade Notes in the Solr Ref Guide for information on upgrading from previous Solr versions:

https://solr.apache.org/guide/8_6/solr-upgrade-notes.html

Please read CHANGES.txt for a full list of bugfixes:

https://solr.apache.org/8_6_1/changes/Changes.html

Solr 8.6.1 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_6_1/changes/Changes.html

Apache Solr™ 8.6.0 available

2020-07-15T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.6.0.

Solr 8.6.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.6.0 Release Highlights:¶

Cross-Collection Join Queries: Join queries can now work cross-collection, even when shared or when spanning nodes.
Search: Performance improvement for some types of queries when using when exact hit count isn't needed by using BlockMax WAND algorithm.
Streaming Expression: Percentiles and standard deviation aggregations added to stats, facet and time series. Streaming expressions added to /export handler. Drill Streaming Expression for efficient and accurate high cardinality aggregation.
Package manager: Support for cluster (CoreContainer) level plugins.
Health Check: HealthCheckHandler can now require that all cores are healthy before returning OK.
Zookeeper read API: A read API at /api/cluster/zk/* to fetch raw ZK data and view contents of a ZK directory.
Admin UI: New panel with security info in admin UI's dashboard.
Query DSL: Support for {param:ref} and {bool: {excludeTags:""}}
Ref Guide: Major redesign of Solr's documentation.

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/8_6_0/changes/Changes.html

Solr 8.6.0 also includes features, optimizations and bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_6_0/changes/Changes.html

Apache Solr™ 8.5.2 available

2020-05-26T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.5.2.

Solr 8.5.2 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.5.2 Bug Fixes:¶

SOLR-14411: Fix regression from SOLR-14359 (Admin UI 'Select an Option')
SOLR-14471: base replica selection strategy not applied to "last place" shards.preference matches

Please read CHANGES.txt for a full list of changes:

https://solr.apache.org/8_5_2/changes/Changes.html

Solr 8.5.2 also includes 1 bugfix in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_5_2/changes/Changes.html

Apache Solr™ 7.7.3 available

2020-04-28T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.7.3.

Solr 7.7.3 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 7.7.3 Release Highlights:¶

SOLR-13779: Use the safe fork of simple-xml for clustering contrib
SOLR-13718: SPLITSHARD (async) with failures in underlying sub-operations can result in data loss
SOLR-12291: prematurely reporting not yet finished async Collections API call as completed when collection's replicas are collocated at least at one node
SOLR-13828: Improve ExecutePlanAction error handling
SOLR-13472: Forwarded requests should skip authorization on receiving nodes
SOLR-13793: HttpSolrCall now maintains internal request count (_forwardedCount) for remote queries and limits them to the number of replicas. This avoids making too many cascading calls to remote servers, which, if not restricted, can bring down nodes containing the said collection
SOLR-13971: Velocity response writer's resource loading now possible only through startup parameters. Also, removed velocity response writer from _default configset
SOLR-14025: VelocityResponseWriter has been hardened - only trusted configsets can render configset provided templates and rendering templates from request parameters has been removed.
SOLR-13158: DataImportHandler: Added enable.dih.dataConfigParam system property to toggle whether the dataConfig param is permitted
SOLR-14259: Fix javabin performance regression fixes

Please read CHANGES.txt for a full list of and changes:

https://solr.apache.org/7_7_3/changes/Changes.html

Solr 7.7.3 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/7_7_3/changes/Changes.html

Apache Solr™ 8.5.1 available

2020-04-16T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.5.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release contains no change over 8.5.0 for Solr. The release is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.5.1 also includes one bugfix in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_5_1/changes/Changes.html

Apache Solr™ 8.5.0 available

2020-03-24T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.5.0.

Solr 8.5.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.5.0 Release Highlights:¶

A new queries property of JSON Request API let to declare queries in Query DSL format and refer to them by their names.
A new command line tool bin/postlogs allows you to index Solr logs into a Solr collection. This is helpful for log analysis and troubleshooting. Documentation is not yet integrated into the Solr Reference Guide, but is available in a branch via GitHub: https://github.com/apache/lucene-solr/blob/visual-guide/solr/solr-ref-guide/src/logs.adoc.
A new stream decorator delete() is available to help solve some issues with traditional delete-by-query, which can be expensive in large indexes.
Solr now has the ability to run with a Java Security Manager enabled.

Please read CHANGES.txt for a full list of changes:

https://solr.apache.org/8_5_0/changes/Changes.html

Solr 8.5.0 also includes improvements and bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_5_0/changes/Changes.html

Apache Solr™ 8.4.1 available

2020-01-13T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.4.1.

Solr 8.4.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.4.1 Release Highlights:¶

Fix for overseer serialization to support rolling upgrade (broken since 8.4)
Fix for SSL support with SOLR_SSL_NEED_CLIENT_AUTH (broken since 8.2)
Package manager to store public keys in a special "trusted" location instead of in ZooKeeper

Please read CHANGES.txt for a full list of changes:

https://solr.apache.org/8_4_1/changes/Changes.html

Solr 8.4.1 also includes and bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_4_1/changes/Changes.html

Apache Solr™ 8.4.0 available

2019-12-29T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.4.0.

Solr 8.4.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.4.0 Release Highlights:¶

A new package management system was introduced in order to ease deploying plugins.
Better security with the out-of-the-box configuration.

A summary of important changes is published in the Solr Reference Guide at https://solr.apache.org/guide/8_4/solr-upgrade-notes.html.

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/8_4_0/changes/Changes.html

Solr 8.4.0 also includes features, optimizations and bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_4_0/changes/Changes.html

Apache Solr™ 8.3.1 available

2019-12-03T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.3.1.

Solr 8.3.1 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.3.1 Release Highlights:¶

JavaBinCodec has concurrent modification of CharArr resulting in corrupt internode updates
findRequestType in AuditEvent is more robust
CoreContainer.auditloggerPlugin is volatile now
Velocity response writer's resource loading now possible only through startup parameters

Please read CHANGES.txt for a full list of changes:

https://solr.apache.org/8_3_1/changes/Changes.html

Solr 8.3.1 also includes and bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_3_1/changes/Changes.html

Apache Solr™ 8.3.0 available

2019-11-02T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.3.0.

Solr 8.3.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 8.3.0 Release Highlights:¶

Two dimensional routed aliases are now available for organizing collections based on the data values of two fields
SPLITSHARD implements a new splitByPrefix option that takes into account the actual document distribution when using compositeIds
QueryElevationComponent can have query rules configured with match="subset" wherein the words need only match a subset of the query's words and in any order
Command line option to export documents to a file
Support deterministic replica routing preferences for better cache usage
Ability to query aliases in Solr Admin UI
JWTAuthPlugin supports multiple JWKS endpoints and multiple IdP issuers
JSON faceting now supports arbitrary ranges for range facets
Support integral plots, cosine distance and string truncation with math expressions (Joel Bernstein)
New cat() stream source to create tuples from lines in local files
Add upper, lower, trim and split Stream Evaluators
Add CsvStream, TsvStream Streaming Expressions and supporting Stream Evaluators
Add CaffeineCache, an efficient implementation of SolrCache
Live SPLITSHARD can lose updates due to cluster state change between checking if the current shard is active and later checking if there are any sub-shard leaders to forward the update to
Fix for SPLITSHARD (async) with failures in underlying sub-operations can result in data loss
Allow dynamic resizing of SolrCache-s
Allow optional redaction of data saved by 'bin/solr autoscaling -save'
Optimized large managed schema modifications (internal O(n^2) problem)
Max idle time support for SolrCache implementations
Add Prometheus Exporter GC and Heap options
SSL: Adding Enabling/Disabling client's hostname verification config
Introducing SolrClient.ping(collection) in SolrJ
Fix for CDCR bootstrap not replicating index to the replicas of target cluster
Fixed a race condition when initializing metrics for new security plugins on security.json change
Fixed JWTAuthPlugin to update metrics prior to continuing w/other filters or returning error
Fixed distributed grouping when multiple 'fl' params are specified
JMX MBeans are not exposed because of race condition between creating platform mbean server and registering mbeans
Fix for class-cast issues during atomic-update 'removeregex' operations
Fix for multi-node race condition to create/remove nodeLost markers
Fix for too many cascading calls to remote servers, which can bring down nodes
Fix for MOVEREPLICA ignoring replica type and always adding 'nrt' replicas
Fix: DistributedZkUpdateProcessor should propagate URP.finish() lifecycle (regression since 8.1)

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/8_3_0/changes/Changes.html

Solr 8.3.0 also includes features, optimizations and bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_3_0/changes/Changes.html

Apache Solr™ 8.2.0 available

2019-07-26T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.2.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 8.2.0 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/8_2_0/changes/Changes.html

Solr 8.2.0 Release Highlights¶

New features¶

Add an update param failOnVersionConflicts=false to updates not fail when there is a version conflict
Add facet2D Streaming Expression.
Preferred replicas on nodes with same system properties as the query master
OpenTracing support for Solr
Raw index data analysis tool (extension of COLSTATUS collection command).
Add recNum Stream Evaluator.
Allow zplot to visualize 2D clusters and convex hulls.
Add a field type for Estonian language to default managed_schema, document about Estonian language analysis in Solr Ref Guide

Bug Fixes¶

Intermittent 401's for internode requests with basicauth enabled.
In 8.1, Atomic Updates were broken (NPE) when the schema declared the new nest_path field even if you weren't using nested docs. In-place updates were not affected (worked)
Fix atomic update encoding issue for UUID, enum, bool, and binary fields.
Impossible to delete a collection with the same name as an existing alias. This fixes also a bug inREINDEXCOLLECTION when used with removeSource=true which could lead to a data loss.

Solr 8.2.0 also includes many other new features as well as numerous optimizations and bugfixes of the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_2_0/changes/Changes.html

Apache Solr™ 7.7.2 available

2019-06-04T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.7.2.

Solr 7.7.2 is available for immediate download at:

https://solr.apache.org/downloads.html

Solr 7.7.2 Release Highlights:¶

High CPU usage in Solr due to Java 8 bug (SOLR–13349)
Multiplicative query boost in certain conditions not applied (SOLR–13126)
InPlace update sometimes fail if schema has a required field (SOLR–11876)
Admin UI inaccessible with RuleBasedAuthorizationPlugin (SOLR–13344)
MetricsHistoryHandler does not work with BasicAuth (SOLR–12860)
ByteArrayUtf8CharSequence cannot be cast to java.lang.String (SOLR–13285)

Please read CHANGES.txt for a full list of and changes:

https://solr.apache.org/7_7_2/changes/Changes.html

Solr 7.7.2 also includes bugfixes in the corresponding Apache Lucene release:

https://lucene.apache.org/core/7_7_2/changes/Changes.html

Apache Solr™ 8.1.1 available

2019-05-28T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.1.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 8.1.1 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/8_1_1/changes/Changes.html

Solr 8.1.1 Release Highlights¶

Fix for a Null Pointer Exception when querying collection through collection alias.

Apache Solr™ 8.1.0 available

2019-05-16T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.1.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 8.1.0 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/8_1_0/changes/Changes.html

Solr 8.1.0 Release Highlights¶

Partial/Atomic Updates for nested documents. This enables atomic updates for nested documents, without the need to supply the whole nested hierarchy (which would be overwritten if absent).
Category Routed Aliases feature introduced for data driven assignment of documents to collections based on values of a field
JWT Token authentication plugin with OpenID Connect implicit flow login through Admin UI
REINDEXCOLLECTION command for re-indexing of existing collections
Collection RENAME command and support using aliases in most collection admin commands
Read-only mode for SolrCloud collections

Solr 8.1.0 also includes many other new features as well as numerous optimizations and bugfixes of the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_1_0/changes/Changes.html

Apache Solr™ 6.6.6 available

2019-04-05T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.6.6

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.6.6 is available for immediate download at:

http://archive.apache.org/dist/lucene/solr/6.6.6

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/6_6_6/changes/Changes.html

Solr 6.6.6 Release Highlights:¶

Fix memory leak (upon collection reload or ZooKeeper session expiry) in ZkIndexSchemaReader.
Fix for Rule-based Authorization skipping authorization if querying node host the collection
(CVE-2017-3164) Make it possible to configure a host whitelist for distributed search

Apache Solr™ 8.0.0 available

2019-03-14T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 8.0.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 8.0.0 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/8_0_0/changes/Changes.html

Solr 8.0.0 Release Highlights¶

Solr now uses HTTP/2 for inter-node communication to attain greater efficiency. Details: Solr is switching from Apache HttpClient to Jetty Client for adding HTTP/2 support. Most frequent inter-communication between nodes like indexing and query are now sent in HTTP/2. HTTP/1.1 practically allows only one outstanding request per TCP connection this means that for sending multiple requests at the same time multiple TCP connections must be established. This leads to waste of resources on both-sides and long GC-pause. Solr 8 with HTTP/2 support overcomes that problem by allowing multiple requests can be sent in parallel using a same TCP connection.
Nested documents (AKA child documents or block join) is significantly improved. Most improvements come from storing and leveraging more information about the relationships in the index, like the named relationship between a child and its parent. This information is used by the [child] doc transformer to return children in nested form instead of flat. There is plenty more that can be done with this in the future. Another key improvement is that nested documents can be deleted or replaced in a natural way without orphaning child documents; although care is still needed with delete-by-query.

Being a major release, Solr 8 removes many deprecated APIs, changes various parameter defaults and behavior. Some changes may require a re-index of your content. You are thus encouraged to thoroughly read the "Upgrade Notes" at:

https://solr.apache.org/8_0_0/changes/Changes.html

Solr 8.0 also includes many other new features as well as numerous optimizations and bugfixes of the corresponding Apache Lucene release:

https://lucene.apache.org/core/8_0_0/changes/Changes.html

Apache Solr Reference Guide 7.7 available

2019-03-11T00:00:00+00:00

The Lucene PMC is pleased to announce that the Solr Reference Guide for 7.7 is now available. This 1,431-page PDF is the definitive guide to using Apache Solr, the search server built on Lucene.

The PDF Guide can be downloaded from: https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-7.7.pdf. It is also available online at https://solr.apache.org/guide/7_7.

Apache Solr™ 7.7.1 available

2019-03-01T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.7.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.7.1 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_7_1/changes/Changes.html

Solr 7.7.1 Release Highlights:¶

Bugfix for ClassCastException when URPs try to read a String field which returns a ByteArrayUTF8CHarSequence (a regression in release 7.7.0).
Bugfix: Autoscaling based replica placement was broken out of the box. Solr 7.6 enabled autoscaling based replica placement by default but in the absence of default cluster policies, autoscaling can place more than 1 replica of the same shard on the same node. Also, the maxShardsPerNode and createNodeSet was not respected. Due to these reasons, this issue reverts the default replica placement policy to the 'legacy' assignment policy that was the default until Solr 7.5.

Apache Solr™ 7.7.0 available

2019-02-11T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.7.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.7.0 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_7_0/changes/Changes.html

Solr 7.7.0 Release Highlights:¶

URI Too Long with large streaming expressions in SolrJ.
A failure while reloading a SolrCore can result in the SolrCore not being closed.
Spellcheck parameters not working in new UI.
New Admin UI Query does not URL-encode the query produced in the URL box.
Rule-base Authorization plugin skips authorization if querying node does not have collection replica.
Solr installer fails on SuSE linux.
Fix incorrect SOLR_SSL_KEYSTORE_TYPE variable in solr start script.
JSON 'terms' Faceting now supports a 'prelim_sort' option to use when initially selecting the top ranking buckets, prior to the final 'sort' option used after refinement.
Add a login page to Admin UI, with initial support for Basic Auth and Kerberos.
New Node-level health check handler at /admin/info/healthcheck and /node/health paths that checks if the node is live, connected to zookeeper and not shutdown.
It is now possible to configure a host whitelist for distributed search.

Apache Solr™ 7.6.0 available

2018-12-14T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.6.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.6.0 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_6_0/changes/Changes.html

Solr 7.6.0 Release Highlights:¶

Field and FieldType now support a new uninvertible option to control using costly field cache or more efficient docValues.
Collections API has been improved to support adding multiple replicas to a collection shard at a time as well as splitting into multiple sub-shards directly..
Autoscaling's suggestions API now include rebalance options as well as suggestions to add new replicas for lost replicas.
Several new Stream Evaluators have been added to include: oscillate, convexHull, enclosingDisk, pairSort, log10, percentiles, and pivot for geometric and scientific analysis.
UnifiedHighlighter has been improved to support best/perfect highlighting accuracy and full phrase highlighting.

Apache Solr™ 7.5.0 available

2018-09-24T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.5.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.5.0 is available for immediate download at: https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_5_0/changes/Changes.html

Solr 7.5.0 Release Highlights:¶

Nested/child documents may now be supplied as a field value instead of stand-off. Future releases will leverage this semantic information.
Enhance Autoscaling policy support to equally distribute replicas on the basis of arbitrary properties.
Nodes are now visible inside a view of the Admin UI "Cloud" tab, listing nodes and key metrics.
The status of zookeeper ensemble is now accessible under the Admin UI Cloud tab.
The new Korean morphological analyzer ("nori") has been added to default distribution.

Apache Solr™ 6.6.5 available

2018-07-03T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.6.5

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.6.5 is available for immediate download at:

http://archive.apache.org/dist/lucene/solr/6.6.5

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/6_6_5/changes/Changes.html

Solr 6.6.5 Release Highlights:¶

Ability to disable configset upload via -Dconfigset.upload.enabled=false startup parameter
Referal to external resources in various config files now disallowed

Apache Solr™ 7.4.0 available

2018-06-27T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.4.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.4.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_4_0/changes/Changes.html

Solr 7.4.0 Release Highlights:¶

A new 'relatedness()' aggregate function for JSON Faceting to enable building Semantic Knowledge Graphs.
Added the TaggerRequestHandler (AKA SolrTextTagger) for tagging text. It's used as a component of NER/ERD systems including query-understanding.
The "Auto Scaling" feature area has been added to and enhanced a lot.
The "Streaming Expressions" feature area has been added to and enhanced a lot.
Upgraded from Log4j 1.x to 2.x. Solr continues to log via SLF4J.

Apache Solr™ 6.6.4 available

2018-05-18T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.6.4

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release includes a bug fix since the 6.6.3 release:

Do not allow to use absolute URIs for including other files in solrconfig.xml and schema parsing

The release is available for immediate download at:

https://www.apache.org/dyn/closer.lua/lucene/solr/6.6.4

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/6_6_4/changes/Changes.html

Apache Solr™ 7.3.1 available

2018-05-15T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.3.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release includes 9 bug fixes since the 7.3.0 release. Some of the major fixes are:

Upgrade commons-fileupload dependency to 1.3.3 to address CVE-2016-1000031
Deleting replicas sometimes fails and causes the replicas to exist in the down state
A successful restore collection should mark the shard state as active and not buffering
Do not allow to use absolute URIs for including other files in solrconfig.xml and schema parsing

Furthermore, this release includes Apache Lucene 7.3.1 which includes 1 bug fix since the 7.3.0 release.

The release is available for immediate download at:

https://www.apache.org/dyn/closer.lua/lucene/solr/7.3.1

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/7_3_1/changes/Changes.html

Apache Solr™ 7.3.0 available

2018-04-04T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.3.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.3.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_3_0/changes/Changes.html

Solr 7.3.0 Release Highlights:¶

OpenNLP request processors
Automatic time-based collection creation
Multivalued primitive fields can be used in sorting
SortableTextField allows sorting and faceting on free text
New stream evaluators
Improvements around leader-initiated recovery
New autoscaling features
A Prometheus metrics exporter
Filtering with exclusions on parent and child queries
Filtering with exclusions via a new query parser
Neural network modelling via learning to rank
Solr runs with Java 10

The Apache Solr Reference Guide for 7.3 is also available in PDF form or online.

Apache Solr™ 6.6.3 available

2018-03-07T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.6.3.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release contains three bugfixes:

Disallow reference to external resources in DataImportHandler's dataConfig request parameter
Allow collections created with legacyCloud=true to be opened if legacyCloud=false
LeaderInitiatedRecoveryThread now retries on UnknownHostException

The release is available for immediate download at:

https://solr.apache.org/mirrors-solr-redir.html

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/6_6_3/changes/Changes.html

Apache Solr™ 7.2.1 available

2018-01-15T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.2.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release includes 3 bug fixes since the 7.2.0 release:

Overseer can never process some last messages.
Rename core in solr standalone mode is not persisted.
QueryComponent's rq parameter parsing no longer considers the defType parameter.
Fix NPE in SolrQueryParser when the query terms inside a filter clause reduce to nothing.

Furthermore, this release includes Apache Lucene 7.2.1 which includes 1 bug fix since the 7.2.0 release.

The release is available for immediate download at:

https://www.apache.org/dyn/closer.lua/lucene/solr/7.2.1

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/7_2_1/changes/Changes.html

Apache Solr™ 7.2.0 available

2017-12-21T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.2.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.2.0 is available for immediate download at:

https://solr.apache.org/downloads.html

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_2_0/changes/Changes.html

Solr 7.2.0 Release Highlights:¶

Bi-directional syncing of CDCR clusters is now supported.
The new synonymQueryStyle field type option allows for better scoring when terms at the same position are hyponyms/hypernyms rather than synonyms.
More stream evaluators, including: matrix operations; spline; derivative; regression; normalization; scaling; correlation; markov chains; time series differencing; and triangular and geometric distributions.
The new facet.matches parameter returns facet buckets only for terms that match a regular expression.
New Autoscaling features: the autoscaling/suggestions API end-point; the UTILIZENODE command, which moves replicas according to autoscaling policies and preferences; and the Autoscaling set-property command.

Apache Solr Reference Guide for 7.1 available

2017-11-02T00:00:00+00:00

The Lucene PMC is pleased to announce that the Solr Reference Guide for 7.1 is now available.

This 1,077-page PDF is the definitive guide to using Apache Solr, the search server built on Lucene.

The PDF Guide can be downloaded from: https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-7.1.pdf.

It is also available online at https://solr.apache.org/guide/7_1.

Apache Solr™ 5.5.5 available

2017-10-24T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.5.5.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release contains one bugfix.

This release includes one critical and one important security fix. Details:

Fix for a 0-day exploit (CVE-2017-12629), details: https://s.apache.org/FJDl. RunExecutableListener has been disabled by default (can be enabled by -Dsolr.enableRunExecutableListener=true) and resolving external entities in the XML query parser (defType=xmlparser or {!xmlparser ... }) is disabled by default.
Fix for CVE-2017-7660: Security Vulnerability in secure inter-node communication in Apache Solr, details: https://s.apache.org/APTY

Furthermore, this release includes Apache Lucene 5.5.5 which includes one security fix since the 5.5.4 release.

The release is available for immediate download at:

https://www.apache.org/dyn/closer.lua/lucene/solr/5.5.5

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/5_5_5/changes/Changes.html

Apache Solr™ 6.6.2 available

2017-10-18T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.6.2

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Highlights for this Solr release includes:¶

Critical security fix: Fix for a 0-day exploit (CVE-2017-12629), details: https://s.apache.org/FJDl. RunExecutableListener has been disabled by default (can be enabled by -Dsolr.enableRunExecutableListener=true) and resolving external entities in the XML query parser (defType=xmlparser or {!xmlparser ... }) is disabled by default.
Fix for a bug where Solr was attempting to load the same core twice (Error message: "Lock held by this virtual machine").

The release is available for immediate download at:

https://www.apache.org/dyn/closer.lua/lucene/solr/6.6.2

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/6_6_2/changes/Changes.html

Apache Solr™ 7.1.0 available

2017-10-17T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.1.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

The release is available for immediate download at:

https://www.apache.org/dyn/closer.lua/lucene/solr/7.1.0

Please read CHANGES.txt for a full list of new features and changes:

https://solr.apache.org/7_1_0/changes/Changes.html

Highlights for this Solr release include:¶

Critical Security Update: Fix for CVE-2017-12629 which is a working 0-day exploit reported on the public mailing list.
Auto-scaling: Solr can now move replicas automatically when a new node is added or an existing node is removed using the auto scaling policy framework introduced in 7.0
Auto-scaling: The 'autoAddReplicas' feature which was limited to shared file systems is now available for all file systems. It has been ported to use the new autoscaling framework internally.
Auto-scaling: New set-trigger, remove-trigger, set-listener, remove-listener, suspend-trigger, resume-trigger APIs
Auto-scaling: New /autoscaling/history API to show past autoscaling actions and cluster events
New JSON based Query DSL for Solr that extends JSON Request API to also support all query parsers and their nested parameters
JSON Facet API: min/max aggregations are now supported on single-valued date fields
Lucene's Geo3D (surface of sphere & ellipsoid) is now supported on spatial RPT fields by setting spatialContextFactory="Geo3D". Furthermore, this is the first time Solr has out of the box support for polygons
Expanded support for statistical stream evaluators such as various distributions, rank correlations, distances and more.
Multiple other optimizations and bug fixes

You are encouraged to thoroughly read the "Upgrade Notes" at https://solr.apache.org/7_1_0/changes/Changes.html or in the CHANGES.txt file accompanying the release.

Solr 7.1 also includes many other new features as well as numerous optimizations and bugfixes of the corresponding Apache Lucene release.

Apache Solr™ 7.0.1 available

2017-10-06T00:00:00+00:00

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.0.1 is available for immediate download at: https://solr.apache.org/downloads.html

This release includes 2 bug fixes since the 7.0.0 release:

Solr 7.0 cannot read indexes from 6.x versions.
Message "Lock held by this virtual machine" during startup. Solr is trying to start some cores twice.

Furthermore, this release includes Apache Lucene 7.0.1 which includes 1 bug fix since the 7.0.0 release.

The release is available for immediate download at:

https://www.apache.org/dyn/closer.lua/lucene/solr/7.0.1

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/7_0_1/changes/Changes.html

Apache Solr Reference Guide for 7.0 available

2017-10-02T00:00:00+00:00

The Lucene PMC is pleased to announce the release of the Apache Solr Reference Guide for Solr 7.0.

This 1,035-page PDF is the definitive guide to Solr. This version adds documentation for new features of Solr, plus detailed information about changes and deprecations you should know about when upgrading from Solr 6.x to Solr 7.0.

You can download the PDF from: https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-7.0.pdf.

An HTML version is also available from: https://solr.apache.org/guide/7_0/.

Apache Solr™ 7.0.0 available

2017-09-20T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 7.0.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 7.0.0 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights for this Solr release include:¶

Replica Types - Solr 7 supports different replica types, which handle updates differently. In addition to pure NRT operation where all replicas build an index and keep a replication log, you can now also add so called PULL replicas, achieving the read-speed optimized benefits of a master/slave setup while at the same time keeping index redundancy.
Auto-scaling. Solr can now allocate new replicas to nodes using a new auto scaling policy framework. This framework will in future releases enable Solr to move shards around based on load, disk etc.
Indented JSON is now the default response format for all APIs, pass wt=xml and/or indent=off to use the previous unindented XML format.
The JSON Facet API now supports two-phase facet refinement to ensure accurate counts and statistics for facet buckets returned in distributed mode.
Streaming Expressions adds a new statistical programming syntax for the statistical analysis of sql queries, random samples, time series and graph result sets.
Analytics Component version 2.0, which now supports distributed collections, expressions over multivalued fields, a new JSON request language, and more.
The new v2 API, exposed at /api/ and also supported via SolrJ, is now the preferred API, but /solr/ continues to work.
A new '_default' configset is used if no config is specified at collection creation. The data-driven functionality of this configset indexes strings as analyzed text while at the same time copying to a '*_str' field suitable for faceting.
Solr 7 is tested with and verified to support Java 9.

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.6.1 available

2017-09-07T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.6.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.6.1 is available for immediate download at: https://solr.apache.org/downloads.html

This release includes 15 bug fixes since the 6.6.0 release. Some of the major fixes are:

Standalone Solr loads UNLOADed core on request
ParallelStream should set the StreamContext when constructing SolrStreams
CloudSolrStream.toExpression incorrectly handles fq clauses
CoreContainer.load needs to send lazily loaded core descriptors to the proper list rather than send them all to the transient lists
Creating a core should write a core.properties file first and clean up on failure
Clean up a few details left over from pluggable transient core and untangling
Provide a way to know when Core Discovery is finished and when all async cores are done loading
CDCR bootstrapping can get into an infinite loop when a core is reloaded
SolrJmxReporter is broken on core reload. This resulted in some or most metrics not being reported via JMX after core reloads, depending on timing
Creating a core.properties fails if the parent of core.properties is a symlinked directory
StreamHandler should allow connections to be closed early
Certain admin UI pages would not load up correctly with kerberos enabled
Fix DOWNNODE -> queue-work znode explosion in ZooKeeper
Upgrade to Hadoop 2.7.4 to fix incompatibility with Java 9
Fix bin/solr.cmd so it can run properly on Java 9

Furthermore, this release includes Apache Lucene 6.6.1 which includes 2 bug fixes since the 6.6.0 release.

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.6.0 available

2017-06-06T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.6.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.6.0 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

Payload support with payload() value source and {!payload_score} and {!payload_check} query parsers
Solr support for SimpleTextCodec
Multi-field support to TermsComponent when requesting terms' statistics
New AtomicUpdateProcessor to convert normal update operations to atomic update operations
UPLOAD command (Config Set API) for uploading zipped configsets
MOVEREPLICA command (Collections API) for moving a replica across nodes
LISTALIASES command (Collections API) to return a list of all collection aliases
STATUS command (Core Admin API) to emit collection details of each core
Basic authentication can be enabled/disabled using bin/solr|bin/solr.cmd
Solr default/example uses WordDelimiterGraphFilterFactory and SynonymGraphFilterFactory
Expose cache statistics using metrics API
CloudSolrClient can now be initialized using the base URL of a Solr instance instead of ZooKeeper hosts
Grouping, CollapseQParser and ExpandComponent support with PointFields
Variance and Standard Deviation aggregators for the JSON Facet API
JSON Faceting now supports a query time 'join' domain change option
CartesianProductStream, which turns a single tuple with a multi-valued field into N tuples, one for each value in the multi-valued field
New Streaming Evaluators: Basic math, UUID, Date/time, correlation, regress, predict, covariance, convolution, normalize
New Streaming Expressions: shuffle, echo, eval, timeseries, let, get, tuple

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.5.1 available

2017-04-27T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.5.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.5.1 is available for immediate download at: https://solr.apache.org/downloads.html

This release includes 11 bug fixes since the 6.5.0 release. Some of the major fixes are:

bin\solr.cmd delete and healthcheck now works again; fixed continuation chars ^
Fix debug related NullPointerException in solr/contrib/ltr OriginalScoreFeature class.
The JSON output of /admin/metrics is fixed to write the container as a map (SimpleOrderedMap) instead of an array (NamedList).
On 'downnode', lots of wasteful mutations are done to ZK.
Fix params persistence for solr/contrib/ltr (MinMax|Standard)Normalizer classes.
The fetch() streaming expression wouldn't work if a value included query syntax chars (like :+-). Fixed, and enhanced the generated query to not pollute the queryCache.
Disable graph query production via schema configuration <fieldtype ... enableGraphQueries="false">. This fixes broken queries for ShingleFilter-containing query-time analyzers when request param sow=false.
Fix indexed="false" on numeric PointFields
SQL AVG function mis-interprets field type.
SQL interface does not use client cache.
edismax with sow=false fails to create dismax-per-term queries when any field is boosted.

Furthermore, this release includes Apache Lucene 6.5.1 which includes 3 bug fixes since the 6.5.0 release.

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.5.0 Available

2017-03-27T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.5.0.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.5.0 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

PointFields (fixed-width multi-dimensional numeric & binary types enabling fast range search) are now supported
In-place updates to numeric docValues fields (single valued, non-stored, non-indexed) supported using atomic update syntax
A new LatLonPointSpatialField that uses points or doc values for query
It is now possible to declare a field as "large" in order to bypass the document cache
New sow=false request param (split-on-whitespace) for edismax & standard query parsers enables query-time multi-term synonyms
XML QueryParser (defType=xmlparser) now supports span queries
hl.maxAnalyzedChars now have consistent default across highlighters
UnifiedSolrHighlighter and PostingsSolrHighlighter now support CustomSeparatorBreakIterator
Scoring formula is adjusted for the scoreNodes function
Calcite Planner now applies constant Reduction Rules to optimize plans
A new significantTerms Streaming Expression that is able to extract the significant terms in an index
StreamHandler is now able to use runtimeLib jars
Arithmetic operations are added to the SelectStream
Added modernized self-documenting /v2 API
The .system collection is now created on first request if it does not exist
Admin UI: Added shard deletion button
Metrics API now supports non-numeric metrics (version, disk type, component state, system properties...)
The disk free and aggregated disk free metrics are now reported
The DirectUpdateHandler2 now implements MetricsProducer and exposes stats via the metrics api and configured reporters.
BlockCache is faster due to less failures when caching a new block
MMapDirectoryFactory now supports "preload" option to ask mapped pages to be loaded into physical memory on init
Security: BasicAuthPlugin now supports standalone mode
Arbitrary java system properties can be passed to zkcli
SolrHttpClientBuilder can be configured via java system property
Javadocs and Changes.html are no longer included in the binary distribution, but are hosted online

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.4.2 Available

2017-03-07T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.4.2.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.4.2 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

Fixed: Serious performance degradation in Solr 6.4 due to the metrics collection. IndexWriter metrics collection turned off by default, directory level metrics collection completely removed (until a better design is found)
Fixed: Transaction log replay can hit an NullPointerException due to new Metrics code
Fixed: NullPointerException in CloudSolrClient when reading stale alias
Fixed: UnifiedHighlighter and PostingsHighlighter bug in PrefixQuery and TermRangeQuery for multi-byte text

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr Reference Guide for 6.4 Available

2017-02-17T00:00:00+00:00

The Lucene PMC is pleased to announce that the Solr Reference Guide for Solr 6.4 has been released.

This 763-page PDF is the definitive guide to using Apache Solr. It can be downloaded from:

https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-6.4.pdf

Apache Solr™ 5.5.4 Available

2017-02-15T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.5.4.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 5.5.4 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

Better validation of filename params in ReplicationHandler
Upgraded commons-fileupload to 1.3.2, fixing a potential vulnerability CVE-2016-3092

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.4.1 Available

2017-02-06T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.4.1.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.4.1 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

"Plugin/Stats" section of the UI doesn't display empty metric types
SOLR_SSL_OPTS was mistakenly overwritten in solr.cmd
Better validation of filename params in ReplicationHandler
Core swapping did not work with new metrics changes in place
Admin UI could not find DataImport handlers due to metrics changes
AnalyzingInfixSuggester/BlendedInfixSuggester now work with core reload

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.4.0 Available

2017-01-23T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.4.0.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.4.0 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

Streaming:

Addition of a HavingStream to Streaming API and Streaming Expressions
Addition of a priority Streaming Expression
Streaming expressions now support collection aliases

Machine Learning:

Configurable Learning-To-Rank (LTR) support: upload feature definitions, extract feature values, upload your own machine learnt models and use them to rerank search results.

Faceting:

Added "param" query type to facet domain filter specification to obtain filters via query parameters
Any facet command can be filtered using a new parameter filter. Example: { type:terms, field:category, filter:"user:yonik" }

Scripts / Command line:

A new command-line tool to manage the snapshots functionality
bin/solr and bin/solr.cmd now use mkroot command

SolrCloud / SolrJ

LukeResponse now supports dynamic fields
Solrj client now supports hierarchical clusters and other topics marker
Collection backup/restore are extensible.

Security:

Support Secure Impersonation / Proxy User for Solr authentication
Key Store type can be specified in solr.in.sh file for SSL
New generic authentication plugins: 'HadoopAuthPlugin' and 'ConfigurableInternodeAuthHadoopPlugin' that delegate all functionality to Hadoop authentication framework

Query / QueryParser / Highlighting:

A new highlighter: The Unified Highlighter. Try it via hl.method=unified; many popular highlighting parameters / features are supported. It's the highest performing highlighter, especially for large documents. Highlighting phrase queries and exotic queries are supported equally as well as the Original Highlighter (aka the default/standard one). Please use this new highlighter and report issues since it will likely become the default one day.
Leading wildcard in complexphrase query parser are now accepted and optimized with the ReversedWildcardFilterFactory when it's provided

Metrics:

Use metrics-jvm library to instrument jvm internals such as GC, memory usage and others.
A lot of metrics have been added to the collection: index merges, index store I/Os, query, update, core admin, core load thread pools, shard replication, tlog replay and replicas
A new /admin/metrics API to return all metrics collected by Solr via API.

Misc changes:

The new config parameter 'maxRamMB'can now limit the memory consumed by the FastLRUCache
A new document processor 'SkipExistingDocumentsProcessor' that skips duplicate inserts and ignores updates to missing docs
FieldCache information fetched via the mbeans handler or seen via the UI now displays the total size used.
A new config flag 'enable' allows to enable/disable any cache

Please note, this release cannot be built from source with Java 8 update 121, use an earlier version instead! This is caused by a bug introduced into the Javadocs tool shipped with that update. The workaround was too late for this Lucene release. Of course, you can use the binary artifacts.

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr Reference Guide for 6.3 Available

2016-11-16T00:00:00+00:00

The Lucene PMC is pleased to announce that the Solr Reference Guide for Solr 6.3 has been released.

This 736-page PDF is the definitive guide to using Apache Solr. It can be downloaded from:

https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-6.3.pdf

Apache Solr™ 6.3.0 Available

2016-11-08T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.3.0.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.3.0 is available for immediate download at: https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

DocValues, streaming, /export, machine learning

Optimize, store and deploy AI models in Solr
Ability to add custom streaming expressions
New streaming expressions such as "fetch", "executor", and "commit" added.
Parallel SQL accepts <, >, =, etc., symbols.
Support facet scoring with the scoreNodes expression
Retrieving docValues as stored values was sped up by using the proper leaf reader rather than ask for a global view. In extreme cases, this leads to a 100x speedup.

Faceting:

facet.method=enum can bypass exact counts calculation with facet.exists=true, it just returns 1 for terms which exists in result docset
Add "overrequest" parameter to JSON Facet API to control amount of overrequest on a distributed terms facet

Logging:

You can now set Solr's log level through environment variable SOLR_LOG_LEVEL
GC logs are rotated by JVM to a max of 9 files, and backed up via bin/solr scripts
Solr's logging verbosity at the INFO level has been greatly reduced by moving much logging to DEBUG level
The solr-8983-console.log file now only logs STDOUT and STDERR output, not all log4j logs as before
Solr's main log file, solr.log, is now written to SOLR_LOGS_DIR without changing log4j.properties

Start scripts:

Allow 180 seconds for shutdown before killing solr (configurable, old limit 5s) (Unix only)
Start scripts now exits with informative message if using wrong Java version
Fixed "bin/solr.cmd zk upconfig" command which was broken on windows
You can now ask for DEBUG logging simply with '-v' option, and for WARN logging with '-q' option

SolrCloud:

The DELETEREPLICA API can accept a 'count' parameter and remove "count" number of replicas from each shard if the shard name is not provided
The config API shows expanded useParams for request handlers inline
Ability to create/delete/list snapshots at collection level
The modify collection API now waits for the modified properties to show up in the cluster state before returning
Many bug fixes related to SolrCloud recovery for data safety and faster recovery times.

Security:

SolrJ now supports Kerberos delegation tokens
Pooled SSL connections were not being re-used. This is now fixed.
Fix for the blockUnknown property which made inter-node communication impossible
Support SOLR_AUTHENTICATION_OPTS and SOLR_AUTHENTICATION_CLIENT_CONFIGURER in windows bin/solr.cmd script
New parameter -u in bin/post to pass basicauth credentials

Misc changes:

Optimizations to lower memory allocations when indexing JSON as well as for replication between solr cloud nodes.
A new Excel workbook (.xlsx) response writer has been added. Use 'wt=xlsx' request parameter on a query request to enable.

See the Solr CHANGES.txt files included with the release for a full list of details.

Apache Solr™ 6.2.1 available

2016-09-20T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.2.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release includes 11 bug fixes since the 6.2.0 release. Some of the major fixes are:

SOLR-9490: BoolField always returning false for non-DV fields when javabin involved (via solrj, or intra node communication)
SOLR-9188: BlockUnknown property makes inter-node communication impossible
SOLR-9389: HDFS Transaction logs stay open for writes which leaks Xceivers
SOLR-9438: Shard split can fail to write commit data on shutdown leading to data loss

Furthermore, this release includes Apache Lucene 6.2.1 which includes 3 bug fixes since the 6.2.0 release.

The release is available for immediate download at: https://www.apache.org/dyn/closer.lua/lucene/solr/6.2.1

See the CHANGES.txt file included with the release for a detailed list of changes.

Apache Solr Reference Guide for 6.2 available

2016-09-13T00:00:00+00:00

The Lucene PMC is pleased to announce that the Solr Reference Guide for Solr 6.2 has been released.

This 717-page PDF is the definitive guide to using Apache Solr. It can be downloaded from:

https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-6.2.pdf

Apache Solr 5.5.3 available

2016-09-09T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.5.3

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release includes 5 bug fixes since the 5.5.2 release.

This release specially contains 2 critical fixes: * The number of TCP connections in CLOSE_WAIT state do not spike during indexing, * PeerSync no longer fails on a node restart due to IndexFingerPrint mismatch.

The release is available for immediate download at: https://www.apache.org/dyn/closer.lua/lucene/solr/5.5.3

See the CHANGES.txt file included with the release for a detailed list of changes.

Apache Solr 6.2.0 available

2016-08-25T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.2.0.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.2.0 is available for immediate download at: https://solr.apache.org/downloads.html

Solr 6.2 Release Highlights:

DocValues, streaming, /export, machine learning

DocValues can now be used with BoolFields
Date and boolean support added to /export handler
Add "scoreNodes" streaming graph expression
Support parallel ETL with the "topic" expression
Feature selection and logistic regression on text via new streaming expressions: "features" and "train"

bin/solr script

Add basic auth support to the bin/solr script
File operations to/from Zookeeper are now supported

SolrCloud

New tag 'role' in replica placement rules, e.g. rule=role:!overseer keeps new repicas off overseer nodes
CDCR: fall back to whole-index replication when tlogs are insufficient
New REPLACENODE command to decommission an existing node and replace it with another new node
New DELETENODE command to delete all replicas on a node

Security

Add Kerberos delegation token support
Support secure impersonation / proxy user for Kerberos authentication

Misc changes

A large number of regressions were fixed in the new Admin UI
New boolean comparison function queries comparing numeric arguments: gt, gte, lt, lte, eq
Upgraded Extraction module to Apache Tika 1.13.
Updated to Hadoop 2.7.2

See the CHANGES.txt file included with the release for a detailed list of changes.

Apache Solr 5.5.2 available

2016-06-25T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.5.2

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release includes 38 bug fixes, documentation updates, etc., since the 5.5.1 release.

The release is available for immediate download at: https://www.apache.org/dyn/closer.lua/lucene/solr/5.5.2

See the CHANGES.txt file included with the release for a detailed list of changes.

Apache Solr 6.1.0 available

2016-06-17T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.1.0.

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.1.0 is available for immediate download at: https://solr.apache.org/downloads.html

Solr 6.1 Release Highlights:

Added graph traversal support, and new "sort" and "random" streaming expressions. It's also now possible to create streaming expressions with the Solr Admin UI.
Fixed the ENUM faceting method to not be unnecessarily rewritten to FCS, which was causing slowdowns.
Reduced garbage creation when creating cache entries.
New [subquery] document transformer to obtatin related documents per result doc.
EmbeddedSolrServer allocates heap much wisely even with plain document list without callbacks.
New GeoJSON response writer for encoding geographic data in query responses.

See the CHANGES.txt file included with the release for a detailed list of changes.

Apache Solr 6.0.1 available

2016-05-28T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.0.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

This release includes 31 bug fixes, documentation updates, etc., since the 6.0.0 release.

The release is available for immediate download at: https://www.apache.org/dyn/closer.lua/lucene/solr/6.0.1

See the CHANGES.txt file included with the release for a detailed list of changes.

Apache Solr 5.5.1 Available

2016-05-05T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.5.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 5.5.1 is available for immediate download at: https://www.apache.org/dyn/closer.lua/lucene/solr/5.5.1

This release contains a number of bug fixes for Solr, as well we Lucene.

See the CHANGES.txt file included with the release for a full list of details.

Solr Reference Guide for 6.0 Available

2016-04-25T00:00:00+00:00

The Lucene PMC is pleased to announce the release of the Solr Reference Guide for 6.0.

The Guide has been extensively updated for Solr 6.0, with new sections on Parallel SQL and Cross Data Center Replication.

The 660 page PDF can be downloaded from https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/apache-solr-ref-guide-6.0.pdf.

Apache Solr 6.0.0 Available

2016-04-08T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 6.0.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 6.0.0 is available for immediate download at: https://solr.apache.org/downloads.html

See the CHANGES.txt

Solr 6.0 Release Highlights:

Improved defaults for "Similarity" used in Solr, in order to provide better default experience for new users.
Improved "Similarity" defaults for users upgrading: DefaultSimilarityFactory has been removed, implicit default Similarity has been changed to SchemaSimilarityFactory, and SchemaSimilarityFactory has been modified to use BM25Similarity as the default for field types that do not explicitly declare a Similarity.
Deprecated GET methods for schema are now accessible through the bulk API. The output has less details and is not backward compatible.
Users should set useDocValuesAsStored="false" to preserve sort order on multi-valued fields that have both stored="true" and docValues="true".
Formatted date-times are more consistent with ISO-8601. BC dates are now better supported since they are now formatted with a leading '-'. AD years after 9999 have a leading '+'. Parse exceptions have been improved.
Deprecated SolrServer and subclasses have been removed, use SolrClient instead.
The deprecated configuration in solrconfig.xml has been removed. Users must remove it from solrconfig.xml.
SolrClient.shutdown() has been removed, use SolrClient.close() instead.
The deprecated zkCredientialsProvider element in solrcloud section of solr.xml is now removed. Use the correct spelling (zkCredentialsProvider) instead.
Added support for executing Parallel SQL queries across SolrCloud collections. Includes StreamExpression support and a new JDBC Driver for the SQL Interface.
New features and capabilities added to the streaming API.
Added support for SELECT DISTINCT queries to the SQL interface.
New GraphQuery to enable graph traversal as a query operator.
New support for Cross Data Center Replication consisting of active/passive replication for separate SolrClouds hosted in separate data centers.
Filter support added to Real-time get.
Column alias support added to the Parallel SQL Interface.
New command added to switch between non/secure mode in zookeeper.
Now possible to use IP fragments in replica placement rules.

Apache Solr 5.5.0 and Reference Guide for 5.5 Available

2016-02-22T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.5.0

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 5.5.0 is available for immediate download at: https://solr.apache.org/downloads.html

See the CHANGES.txt file included with the release for a full list of details.

This is expected to be the last 5.x feature release before Solr 6.0.

Release Highlights:

The schema version has been increased to 1.6, and Solr now returns non-stored doc values fields along with stored fields
The PERSIST CoreAdmin action has been removed
The mergePolicy element is deprecated in favor of a similar mergePolicyFactory element, in solrconfig.xml
CheckIndex now works on HdfsDirectory
RuleBasedAuthorizationPlugin now allows wildcards in the role, and accepts an 'all' permission
Users can now choose compression mode in SchemaCodecFactory
Solr now supports Lucene's XMLQueryParser
Collections APIs now have async support
Uninverted field faceting is re-enabled, for higher performance on rarely changing indices

Also available is the Solr Reference Guide for Solr 5.5. This PDF serves as the definitive user's manual for Solr 5.5. It can be downloaded from the Apache mirror network: https://s.apache.org/Solr-Ref-Guide-PDF

Apache Lucene/Solr development moves to GIT

2016-02-08T00:00:00+00:00

As of January 23rd 2016, Lucene/Solr source code is hosted in Apache's GIT repository. This means that the old SVN repository is now stale and should not be used. For information on working with git, please consult the Solr web site and the wiki.

The GitHub mirror remains at the same location as before, but the contents have changed. We now have one unified repo preserving the full history of both Lucene and Solr. If you had a GitHub fork, you will find that it has changed its "forked from" location, and any Pull Request will go to that other fork instead of to the Lucene developers. The only known solution is to delete your existing fork and re-fork from GitHub.

If you had active code changes and Pull Requests against our old GitHub mirror, please see the wiki for some suggestions on how to proceed.

The PMC is happy to answer any question you may have regarding this change.

Apache Solr 5.3.2 Available

2016-01-23T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.3.2

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 5.3.2 is available for immediate download at: https://www.apache.org/dyn/closer.lua/lucene/solr/5.3.2

This release contains a number of bug fixes for Solr, as well we Lucene.

See the CHANGES.txt file included with the release for a full list of details.

Apache Solr 5.4.1 Available

2016-01-23T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.4.1

Solr is the popular, blazing fast, open source NoSQL search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

Solr 5.4.1 is available for immediate download at: https://solr.apache.org/downloads.html

This release especially contains a fix for a faceting bug that could cause facet counts to include deleted documents and a fix for a corruption bug that was introduced in version 5.4.0. If you are on 5.4.0 and using BINARY, SORTED_NUMERIC or SORTED_SET doc values, upgrading to 5.4.1 is strongly recommended.

See the CHANGES.txt file included with the release for a full list of details.

Apache Solr Reference Guide for 5.4 Available

2015-12-15T00:00:00+00:00

Hot on the heels of the Solr 5.4.0 release (see below), the Lucene PMC is pleased to announce the release of the Apache Solr Reference Guide for Solr 5.4.

This 598 page PDF file can be downloaded from https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/.

Apache Solr 5.4.0 Available

2015-12-14T00:00:00+00:00

The Lucene PMC is pleased to announce the release of Apache Solr 5.4.0

The release can be downloaded from https://solr.apache.org/downloads.html

Highlights of this Solr release include:¶

UI Changes¶

The rearchitected Admin UI is now prominently linked to from the existing UI, and includes support for managing collections as well as creating and removing fields via the schema tab. Expect it to be default in the next release.

API Features¶

New Collections APIs for migrating from clusterstate.json to per-collection state.json and forcing the election of a leader when all replicas in a shard are down.
A new configset management API has been added.

Querying Features¶

Filter cache is now accessible via a solr query syntax.
ScoreJoins can now refer to a single-sharded collection that is replicated on all nodes.
Add boost support, and 'exclude the queried document' in MoreLikeThis QParser.
Add a 'sort' local param to the collapse QParser to support using complex sort options to select the representitive doc for each collapsed group.

Other Features¶

SolrJ now has support for connecting to Solr using basic authentication.
Analyzing suggesters can now filter suggestions by a context field.
JSON Facet API: add "method" param to terms/field facets to give an execution hint for what method should be used to facet.
CloneFieldUpdateProcessorFactory now supports choosing a "dest" field name based on a regex pattern and replacement init options.
Provide pluggable context tool support for VelocityResponseWriter.