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https://issues.apache.org/jira/browse/LUCENE-6633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608010#comment-14608010
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ASF subversion and git services commented on LUCENE-6633:
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Commit 1688410 from [~jpountz] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1688410 ]
LUCENE-6633: Deprecate DuplicateFilter.
> Remove DuplicateFilter
> ----------------------
>
> Key: LUCENE-6633
> URL: https://issues.apache.org/jira/browse/LUCENE-6633
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 5.3
>
> Attachments: LUCENE-6633.patch
>
>
> DuplicateFilter is a filter which aims at only exposing a single document per
> unique field value. It has some flaws, for instance it only works if you have
> a single leaf and we now have a better way to handle this use-case with
> DiversifiedTopDocsCollector. So I suggest that we just remove it and
> recommend users to use DiversifiedTopDocsCollector instead.
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