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https://issues.apache.org/jira/browse/LUCENE-5867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14086311#comment-14086311
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Robert Muir commented on LUCENE-5867:
-------------------------------------

It is not intended to be faster or anything like that. The idea is that this is 
simpler to use for use-cases where the typical ranking "gets in the way".

> Add BooleanSimilarity
> ---------------------
>
>                 Key: LUCENE-5867
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5867
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Robert Muir
>         Attachments: LUCENE-5867.patch
>
>
> This can be used when the user doesn't want tf/idf scoring for some reason. 
> The idea is that the score is just query_time_boost * index_time_boost, no 
> queryNorm/IDF/TF/lengthNorm...



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