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

Packages that use FilterMergePolicy
Package
Description
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
Modifier and Type
Class
Description
`class`
`OneMergeWrappingMergePolicy`
A wrapping merge policy that wraps the `MergePolicy.OneMerge` objects returned by the wrapped merge policy.
`final 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)`.