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https://issues.apache.org/jira/browse/LUCENE-8505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17389929#comment-17389929
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ASF subversion and git services commented on LUCENE-8505:
---------------------------------------------------------

Commit c2cb22f993605e7b0fd1c68d690aaff3a751162a in lucene-solr's branch 
refs/heads/branch_8x from Nhat Nguyen
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=c2cb22f ]

LUCENE-10032: Remove leafDocMaps from MergeState (#2536)

These maps are no longer useful after LUCENE-8505.

> 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
>            Priority: Minor
>             Fix For: 8.0
>
>         Attachments: LUCENE-8505.patch
>
>
> 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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