Index changes are lost if you call prepareCommit() then close()
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                 Key: LUCENE-3872
                 URL: https://issues.apache.org/jira/browse/LUCENE-3872
             Project: Lucene - Java
          Issue Type: Bug
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 3.6, 4.0


You are supposed to call commit() after calling prepareCommit(), but... if you 
forget, and call close() after prepareCommit() without calling commit(), then 
any changes done after the prepareCommit() are silently lost (including 
adding/deleting docs, but also any completed merges).

Spinoff from java-user thread "lots of .cfs (compound files) in the index 
directory" from Tim Bogaert.

I think to fix this, IW.close should throw an IllegalStateException if 
prepareCommit() was called with no matching call to commit().

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