Implicit RequestHandlers
Solr ships with many out-of-the-box RequestHandlers, which are called implicit because they do not need to be configured in solrconfig.xml before you are able to use them.
These handlers have pre-defined default parameters, known as paramsets, which can be modified if necessary.
Available Implicit Endpoints
| All endpoint paths listed below should be placed after Solr’s host and port (if a port is used) to construct a URL. |
Admin Handlers
Many of these handlers are used throughout the Admin UI to show information about Solr.
| File | Returns content of files in
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| Logging | Retrieve and modify registered loggers.
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| Luke | Expose the internal lucene index. This handler must have a collection name in the path to the endpoint. Documentation: http://wiki.apache.org/solr/LukeRequestHandler
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| MBeans | Provide info about all registered SolrInfoMBeans. This handler must have a collection name in the path to the endpoint. Documentation: MBean Request Handler
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| Ping | Health check. This handler must have a collection name in the path to the endpoint. Documentation: Ping
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| Plugins | Return info about all registered plugins. This handler must have a collection name in the path to the endpoint.
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| System Properties | Return JRE system properties.
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| Segments | Return info on last commit generation Lucene index segments.
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| System Settings | Return server statistics and settings. Documentation: https://wiki.apache.org/solr/SystemInformationRequestHandlers#SystemInfoHandler
This endpoint can also take the collection or core name in the path ( | ||||||
| Threads | Return info on all JVM threads.
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| Health | Reporting the health of the node (available only in SolrCloud mode)
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This endpoint can also take the collection or core name in the path (solr/<collection>/admin/health or solr/<core>/admin/health).
Analysis Handlers
| Document Analysis | Return a breakdown of the analysis process of the given document. Documentation: https://wiki.apache.org/solr/AnalysisRequestHandler
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| Field Analysis | Return index- and query-time analysis over the given field(s)/field type(s). This handler drives the Analysis screen in Solr’s Admin UI.
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Handlers for Configuration
| Config API | Retrieve and modify Solr configuration. Documentation: Config API
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| Dump | Echo the request contents back to the client.
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| Replication | Replicate indexes for SolrCloud recovery and Master/Slave index distribution. This handler must have a core name in the path to the endpoint.
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| Schema API | Retrieve and modify the Solr schema. Documentation: Schema API
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Query Handlers
| Export | Export full sorted result sets. Documentation: Exporting Result Sets
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| RealTimeGet | Low-latency retrieval of the latest version of a document. Documentation: RealTime Get
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| Graph Traversal | Return GraphML formatted output from a Documentation: Graph Traversal
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| SQL | Front end of the Parallel SQL interface. Documentation: SQL Request Handler
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| Streaming Expressions | Distributed stream processing. Documentation: Streaming Requests and Responses
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| Terms | Return a field’s indexed terms and the number of documents containing each term. Documentation: Using the Terms Component in a Request Handler
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Update Handlers
| Update | Add, delete and update indexed documents formatted as SolrXML, CSV, SolrJSON or javabin. Documentation: Uploading Data with Index Handlers
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| CSV Updates | Add and update CSV-formatted documents. Documentation: CSV Update Convenience Paths
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| JSON Updates | Add, delete and update SolrJSON-formatted documents. Documentation: JSON Update Convenience Paths
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| Custom JSON Updates | Add and update custom JSON-formatted documents. Documentation: Transforming and Indexing Custom JSON
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How to View Implicit Handler Paramsets
You can see configuration for all request handlers, including the implicit request handlers, via the Config API.
To include the expanded paramset in the response, as well as the effective parameters from merging the paramset parameters with the built-in parameters, use the expandParams request parameter. For the /export request handler, you can make a request like this:
V1 API
http://localhost:8983/solr/gettingstarted/config/requestHandler?componentName=/export&expandParams=trueV2 API
http://localhost:8983/api/collections/gettingstarted/config/requestHandler?componentName=/export&expandParams=trueThe response will look similar to:
{
"config": {
"requestHandler": {
"/export": {
"class": "solr.ExportHandler",
"useParams": "_EXPORT",
"components": ["query"],
"defaults": {
"wt": "json"
},
"invariants": {
"rq": "{!xport}",
"distrib": false
},
"name": "/export",
"_useParamsExpanded_": {
"_EXPORT": "[NOT AVAILABLE]"
},
"_effectiveParams_": {
"distrib": "false",
"omitHeader": "true",
"wt": "json",
"rq": "{!xport}"
}
}
}
}
}How to Edit Implicit Handler Paramsets
Because implicit request handlers are not present in solrconfig.xml, configuration of their associated default, invariant and appends parameters may be edited via the  Request Parameters API using the paramset listed in the above table. However, other parameters, including SearchHandler components, may not be modified. The invariants and appends specified in the implicit configuration cannot be overridden.