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

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

- - ### Uses of IndexWriter in org.apache.lucene.index

    Methods in org.apache.lucene.index with parameters of type IndexWriter
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | ConcurrentMergeScheduler.`doMerge(IndexWriter writer, MergePolicy.OneMerge merge)` Does the actual merge, by calling `merge(org.apache.lucene.index.MergePolicy.OneMerge)`
    `protected abstract DirectoryReader` | DirectoryReader.`doOpenIfChanged(IndexWriter writer, boolean applyAllDeletes)` Implement this method to support `DirectoryReader.openIfChanged(DirectoryReader,IndexWriter,boolean)`.
    `protected DirectoryReader` | StandardDirectoryReader.`doOpenIfChanged(IndexWriter writer, boolean applyAllDeletes)`
    `protected DirectoryReader` | FilterDirectoryReader.`doOpenIfChanged(IndexWriter writer, boolean applyAllDeletes)`
    `protected ConcurrentMergeScheduler.MergeThread` | ConcurrentMergeScheduler.`getMergeThread(IndexWriter writer, MergePolicy.OneMerge merge)` Create and return a new MergeThread
    `protected boolean` | ConcurrentMergeScheduler.`maybeStall(IndexWriter writer)` This is invoked by `ConcurrentMergeScheduler.merge(org.apache.lucene.index.IndexWriter, org.apache.lucene.index.MergeTrigger, boolean)` to possibly stall the incoming thread when there are too many merges running or pending.
    `void` | SerialMergeScheduler.`merge(IndexWriter writer, MergeTrigger trigger, boolean newMergesFound)` Just do the merges in sequence.
    `void` | ConcurrentMergeScheduler.`merge(IndexWriter writer, MergeTrigger trigger, boolean newMergesFound)`
    `abstract void` | MergeScheduler.`merge(IndexWriter writer, MergeTrigger trigger, boolean newMergesFound)` Run the merges provided by `getNextMerge()`.
    `void` | NoMergeScheduler.`merge(IndexWriter writer, MergeTrigger trigger, boolean newMergesFound)`
    `static DirectoryReader` | DirectoryReader.`open(IndexWriter writer)` Open a near real time IndexReader from the `IndexWriter`.
    `static DirectoryReader` | DirectoryReader.`open(IndexWriter writer, boolean applyAllDeletes, boolean writeAllDeletes)` Expert: open a near real time IndexReader from the `IndexWriter`, controlling whether past deletions should be applied.
    `static DirectoryReader` | DirectoryReader.`openIfChanged(DirectoryReader oldReader, IndexWriter writer)` Expert: If there changes (committed or not) in the `IndexWriter` versus what the provided reader is searching, then open and return a new IndexReader searching both committed and uncommitted changes from the writer; else, return null (though, the current implementation never returns null).
    `static DirectoryReader` | DirectoryReader.`openIfChanged(DirectoryReader oldReader, IndexWriter writer, boolean applyAllDeletes)` Expert: Opens a new reader, if there are any changes, controlling whether past deletions should be applied.

    Constructors in org.apache.lucene.index with parameters of type IndexWriter
    Constructor and Description
    `MergeThread(IndexWriter writer, MergePolicy.OneMerge merge)` Sole constructor.
    `ReaderManager(IndexWriter writer)` Creates and returns a new ReaderManager from the given `IndexWriter`.
    `ReaderManager(IndexWriter writer, boolean applyAllDeletes, boolean writeAllDeletes)` Expert: creates and returns a new ReaderManager from the given `IndexWriter`, controlling whether past deletions should be applied.

  - ### Uses of IndexWriter in org.apache.lucene.search

    Constructors in org.apache.lucene.search with parameters of type IndexWriter
    Constructor and Description
    `ControlledRealTimeReopenThread(IndexWriter writer, ReferenceManager<T> manager, double targetMaxStaleSec, double targetMinStaleSec)` Create ControlledRealTimeReopenThread, to periodically reopen the `ReferenceManager`.
    `SearcherManager(IndexWriter writer, boolean applyAllDeletes, boolean writeAllDeletes, SearcherFactory searcherFactory)` Expert: creates and returns a new SearcherManager from the given `IndexWriter`, controlling whether past deletions should be applied.
    `SearcherManager(IndexWriter writer, SearcherFactory searcherFactory)` Creates and returns a new SearcherManager from the given `IndexWriter`.

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