## 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.

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