[jira] [Created] (LUCENE-8505) IndexWriter#addIndices should not sort indices if they are not already sorted

["Jim Ferenczi (JIRA)" <ji...@apache.org>]

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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