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document what IW.close is doing and how to 'actually close' if you want that
git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1372839 13f79535-47bb-0310-9956-ffa450edef68
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@ -763,8 +763,15 @@ public class IndexWriter implements Closeable, TwoPhaseCommit {
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}
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/**
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* Commits all changes to an index and closes all
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* associated files. Note that this may be a costly
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* Commits all changes to an index, waits for pending merges
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* to complete, and closes all associated files.
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* <p>
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* This is a "slow graceful shutdown" which may take a long time
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* especially if a big merge is pending: If you only want to close
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* resources use {@link #rollback()}. If you only want to commit
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* pending changes and close resources see {@link #close(boolean)}.
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* <p>
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* Note that this may be a costly
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* operation, so, try to re-use a single writer instead of
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* closing and opening a new one. See {@link #commit()} for
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* caveats about write caching done by some IO devices.
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