## Uses of Class
org.apache.lucene.util.SetOnce

Packages that use SetOnce
Package | Description
--- | ---
org.apache.lucene.index | Code to maintain and access indices.

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

Fields in org.apache.lucene.index declared as SetOnce
Modifier and Type | Field and Description
--- | ---
`protected SetOnce<IndexWriter>` | MergePolicy.`writer` `IndexWriter` that contains this instance.