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https://issues.apache.org/jira/browse/LUCENE-7730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894073#comment-15894073
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Alan Woodward commented on LUCENE-7730:
---------------------------------------

Should we try and separate norms encoding from the different Similarity 
implementations?  It seems a bit odd to me that you have to set a Similarity on 
IndexWriterConfig, but then you can use a completely different Sim at search 
time and it will all still work, providing that it encodes norms in the same 
way.  Perhaps instead we should abstract out a NormsEncoding interface, which 
gets passed both to IWC and to Similarity?

> 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
>
> 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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