apply delete-by-Term and docID immediately to newly flushed segments
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                 Key: LUCENE-2897
                 URL: https://issues.apache.org/jira/browse/LUCENE-2897
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 3.2, 4.0


Spinoff from LUCENE-2324.

When we flush deletes today, we keep them as buffered Term/Query/docIDs that 
need to be deleted.  But, for a newly flushed segment (ie fresh out of the 
DWPT), this is silly, because during flush we visit all terms and we know their 
docIDs.  So it's more efficient to apply the deletes (for this one segment) at 
that time.

We still must buffer deletes for all prior segments, but these deletes don't 
need to map to a docIDUpto anymore; ie we just need a Set.

This issue should wait until LUCENE-1076 is in since that issue cuts over 
buffered deletes to a transactional stream.

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