## Uses of Class
org.apache.lucene.index.FilterMergePolicy

Packages that use FilterMergePolicy
org.apache.lucene.index: Code to maintain and access indices.

### Uses of FilterMergePolicy in org.apache.lucene.index

Subclasses of FilterMergePolicy in org.apache.lucene.index
`class` `OneMergeWrappingMergePolicy` A wrapping merge policy that wraps the `MergePolicy.OneMerge` objects returned by the wrapped merge policy.
`class` `SoftDeletesRetentionMergePolicy` This `MergePolicy` allows to carry over soft deleted documents across merges.
`class` `UpgradeIndexMergePolicy` This `MergePolicy` is used for upgrading all existing segments of an index when calling `IndexWriter.forceMerge(int)`.