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https://issues.apache.org/jira/browse/LUCENE-5116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709506#comment-13709506
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Shai Erera commented on LUCENE-5116:
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+1. This should be an easy and nice improvement. There's no need to spend the
work adding those segments just so they are dropped on the next merge.
> IW.addIndexes doesn't prune all deleted segments
> ------------------------------------------------
>
> Key: LUCENE-5116
> URL: https://issues.apache.org/jira/browse/LUCENE-5116
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-5116_test.patch
>
>
> at the least, this can easily create segments with maxDoc == 0.
> It seems buggy: elsewhere we prune these segments out, so its expected to
> have a commit point with no segments rather than a segment with 0 documents...
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