Jim Ferenczi created LUCENE-8505:
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Summary: IndexWriter#addIndices should not sort indices if they
are not already sorted
Key: LUCENE-8505
URL: https://issues.apache.org/jira/browse/LUCENE-8505
Project: Lucene - Core
Issue Type: Improvement
Reporter: Jim Ferenczi
Today IndexWriter#addIndices silently re-sort non-sorted indices when they are
added in a sorted index. This is not safe because the sort is done entirely in
memory and cannot handle big segments efficiently. This leniency was added
because prior to 6.5, segments produced by flushes were not sorted, they had to
wait for a merge to apply the index sorting. Now that segments are always
sorted (LUCENE-7579) we should remove this ability and throw an error if the
sort of the current index does not match with the candidate.
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