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https://issues.apache.org/jira/browse/LUCENE-10157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17472952#comment-17472952
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Cameron VandenBerg commented on LUCENE-10157:
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I like your idea of forking the TermScorer to create the IndriTermScorer and 
specializing the IndriAnd and IndriOr operators.  I actually had it this way in 
the original patch that I had posted.  The tricky part was that to create an 
IndriTermScorer, I also needed to create an IndriTermQuery and IndriTermWeight 
so that I could instantiate the IndriTermScorer, but TermWeight was final in 
lucene so I could not extend this class.  I wanted all other functionality in 
TermWeight except creating a different scorer (the IndriTermScorer).  Is there 
a good way to do this other than reimplementing TermQuery and TermWeight?  I 
worried about reimplementing these classes because I don't want IndriTermQuery 
and IndriTermWeight to differ from the lucene implementations of TermQuery and 
TermWeight if updates are made to those classes.

> Add Additional Indri Search Engine Functionality to Lucene
> ----------------------------------------------------------
>
>                 Key: LUCENE-10157
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10157
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/queryparser, core/search
>            Reporter: Cameron VandenBerg
>            Priority: Major
>         Attachments: LUCENE-10157.patch
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> In Jira issue LUCENE-9537, basic functionality from the Indri search engine 
> ([http://lemurproject.org/indri.php]) was added to Lucene.  With that 
> functionality in place, we would love to build upon that to add additional 
> Indri queries and an Indri query parser to Lucene to broaden the Indri 
> functionality within Lucene.  In this patch, I have added the Indri NOT, the 
> INDRI OR, and the Indri WeightedSum functionality.  I have also included an 
> IndriQueryParser for accessing this functionality.  More information on these 
> query operators can be seen here: 
> [https://sourceforge.net/p/lemur/wiki/Belief%20Operations/] and here: 
> [https://sourceforge.net/p/lemur/wiki/Indri%20Query%20Language%20Reference/.|https://sourceforge.net/p/lemur/wiki/Indri%20Query%20Language%20Reference/]
>  
> I would be very excited to work with the Lucene community again to try to add 
> this functionality.  I am open to suggestions, and I am happy to make any 
> changes that might be suggested.  Thank you!



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