VersionInfo (Solr 9.8.0 core API)

java.lang.Object
- org.apache.solr.update.VersionInfo

```
public class VersionInfo
extends Object
```
Related to the _version_ field, in connection with the UpdateLog.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Constructor Summary

Constructors
Constructor Description

VersionInfo(UpdateLog ulog)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static SchemaField`	`getAndCheckVersionField(IndexSchema schema)`	Gets and returns the `CommonParams.VERSION_FIELD` from the specified schema, after verifying that it is indexed, stored, and single-valued.
`long`	`getNewClock()`
`SchemaField`	`getVersionField()`
`Long`	`getVersionFromIndex(org.apache.lucene.util.BytesRef idBytes)`	Returns the latest version from the index, searched by the given id (bytes) as seen from the realtime searcher.
`Long`	`lookupVersion(org.apache.lucene.util.BytesRef idBytes)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - VersionInfo
```
public VersionInfo(UpdateLog ulog)
```
- Method Detail
  - getAndCheckVersionField
```
public static SchemaField getAndCheckVersionField(IndexSchema schema)
                                           throws org.apache.solr.common.SolrException
```
    Gets and returns the CommonParams.VERSION_FIELD from the specified schema, after verifying that it is indexed, stored, and single-valued. If any of these pre-conditions are not met, it throws a SolrException with a user suitable message indicating the problem.
    
    Throws:
    
    org.apache.solr.common.SolrException
  - getVersionField
```
public SchemaField getVersionField()
```
  - getNewClock
```
public long getNewClock()
```
  - lookupVersion
```
public Long lookupVersion(org.apache.lucene.util.BytesRef idBytes)
```
  - getVersionFromIndex
```
public Long getVersionFromIndex(org.apache.lucene.util.BytesRef idBytes)
```
    Returns the latest version from the index, searched by the given id (bytes) as seen from the realtime searcher. Returns null if no document can be found in the index for the given id.