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https://issues.apache.org/jira/browse/LUCENE-6747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727122#comment-14727122
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Adrien Grand commented on LUCENE-6747:
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Mark, I see this issue under "Lucene 6.0.0" in the CHANGES.txt file on trunk,
should it be moved to 5.4.0?
> FingerprintFilter - a TokenFilter for clustering/linking purposes
> -----------------------------------------------------------------
>
> Key: LUCENE-6747
> URL: https://issues.apache.org/jira/browse/LUCENE-6747
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Mark Harwood
> Priority: Minor
> Fix For: Trunk, 5.4
>
> Attachments: fingerprintv1.patch, fingerprintv2.patch,
> fingerprintv3.patch, fingerprintv4.patch
>
>
> A TokenFilter that emits a single token which is a sorted, de-duplicated set
> of the input tokens.
> This approach to normalizing text is used in tools like OpenRefine[1] and
> elsewhere [2] to help in clustering or linking texts.
> The implementation proposed here has a an upper limit on the size of the
> combined token which is output.
> [1] https://github.com/OpenRefine/OpenRefine/wiki/Clustering-In-Depth
> [2]
> https://rajmak.wordpress.com/2013/04/27/clustering-text-map-reduce-in-python/
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