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https://issues.apache.org/jira/browse/LUCENE-7730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012832#comment-16012832
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Robert Muir commented on LUCENE-7730:
-------------------------------------

I think there is a bit of a trap wrt classicsimilarity, maybe can 
ClassicSimilarity be moved out of core since it is the only one no longer 
compatible with the others? e.g. maybe into misc/ or somewhere else. 


> Better encode length normalization in similarities
> --------------------------------------------------
>
>                 Key: LUCENE-7730
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7730
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Adrien Grand
>         Attachments: LUCENE-7730.patch, LUCENE-7730.patch, LUCENE-7730.patch
>
>
> Now that index-time boosts are gone (LUCENE-6819) and that indices record the 
> version that was used to create them (for backward compatibility, 
> LUCENE-7703), we can look into storing the length normalization factor more 
> efficiently.



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