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https://issues.apache.org/jira/browse/LUCENE-7581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15722476#comment-15722476
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Ferenczi Jim commented on LUCENE-7581:
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[~mikemccand] I think so too. I'll work on a patch.
> IndexWriter#updateDocValues can break index sorting
> ---------------------------------------------------
>
> Key: LUCENE-7581
> URL: https://issues.apache.org/jira/browse/LUCENE-7581
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Ferenczi Jim
> Attachments: LUCENE-7581.patch
>
>
> IndexWriter#updateDocValues can break index sorting if it is called on a
> field that is used in the index sorting specification.
> TestIndexSorting has a test for this case: #testConcurrentDVUpdates
> but only L1 merge are checked. Any LN merge would fail the test because the
> inner sort of the segment is not re-compute during/after DV updates.
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