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https://issues.apache.org/jira/browse/LUCENE-7498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15967404#comment-15967404
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Alessandro Benedetti commented on LUCENE-7498:
----------------------------------------------

Design and development is finished, I will merge current trunk and open a pull 
request from my fork to review here.
It is a huge PR as it contains a big refactor and testing of the More Like This 
( from a monolith to structured cohesive classes).
I will update the Jira issue with the PR and brief description of modification 
and benefits.

> More Like This to Use BM25
> --------------------------
>
>                 Key: LUCENE-7498
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7498
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/other
>            Reporter: Alessandro Benedetti
>
> BM25 is now the default similarity, but the more like this is still using the 
> old TF/IDF .
>  
> This issue is to move to BM25 and refactor the MLT to be more organised, 
> extensible and maintainable.
> Few extensions will follow later, but the focus of this issue will be :
>  - BM25
> - code refactor + tests



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