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https://issues.apache.org/jira/browse/LUCENE-6633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-6633.
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Resolution: Fixed
> 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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