Support updateDocument() with DWPTs
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                 Key: LUCENE-2956
                 URL: https://issues.apache.org/jira/browse/LUCENE-2956
             Project: Lucene - Java
          Issue Type: Bug
            Reporter: Michael Busch
            Assignee: Michael Busch
            Priority: Minor


With separate DocumentsWriterPerThreads (DWPT) it can currently happen that the 
delete part of an updateDocument() is flushed and committed separately from the 
corresponding new document.

We need to make sure that updateDocument() is always a atomic operation from a 
IW.commit() and IW.getReader() perspective.  See LUCENE-2324 for more details.

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