Interruptible segment merges
----------------------------

                 Key: LUCENE-887
                 URL: https://issues.apache.org/jira/browse/LUCENE-887
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Index
            Reporter: Michael Busch
            Priority: Minor
             Fix For: 2.2


Adds the ability to IndexWriter to interrupt an ongoing merge. This might be 
necessary when Lucene is e. g. running as a service and has to stop indexing 
within a certain period of time due to a shutdown request.

A solution would be to add a new method shutdown() to IndexWriter which 
satisfies the following two requirements:
- if a merge is happening, abort it
- flush the buffered docs but do not trigger a merge 

See also discussions about this feature on java-dev:
http://www.gossamer-threads.com/lists/lucene/java-dev/49008



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