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https://issues.apache.org/jira/browse/SOLR-13751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17176407#comment-17176407
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Andy Webb commented on SOLR-13751:
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Great, thanks [~cpoerschke]!
> Add BooleanSimilarityFactory to Solr
> ------------------------------------
>
> Key: SOLR-13751
> URL: https://issues.apache.org/jira/browse/SOLR-13751
> Project: Solr
> Issue Type: New Feature
> Reporter: Andy Webb
> Assignee: Christine Poerschke
> Priority: Minor
> Fix For: master (9.0), 8.7
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Solr doesn't expose Lucene's BooleanSimilarity (ref LUCENE-5867) so it's not
> available for use in situations where BM25/TDF-IF are not useful. (Fields
> using this similarity will likely also set omitNorms and
> omitTermFreqAndPositions to true.)
> Our use case is ngram-driven suggestions, where the frequency of occurrence
> of a particular sequence of characters is not something users would expect to
> be taken into account when ordering suggestions.
>
> Here's my PR: [https://github.com/apache/lucene-solr/pull/867] (I'm at
> Activate if anyone would like to talk this through in person.)
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