Adrien Grand created LUCENE-8600:
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             Summary: DocValuesFieldUpdates should use a better sort
                 Key: LUCENE-8600
                 URL: https://issues.apache.org/jira/browse/LUCENE-8600
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand


This is a follow-up to LUCENE-8598: Simon identified that swaps are a 
bottleneck to applying doc-value updates, in particular due to the overhead of 
packed ints. It turns out that InPlaceMergeSorter does LOTS of swaps in order 
to perform in-place. Replacing with a more efficient sort should help.



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