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https://issues.apache.org/jira/browse/LUCENE-9537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17468942#comment-17468942
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Cameron VandenBerg commented on LUCENE-9537:
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Hello [~jpountz]! Thank you for finding this. I have fixed this issue in my
latest PR (LUCENE-10157), which I just updated tonight. My original thought
was that I needed the IndriScorer because I wanted to use the boosts outside of
the Similarity just like we do in our Indri Search Engine. However, I now feel
that it makes more sense for the Indri scoring to use boosts in the same way
that lucene does (inside the Similarity), which allows me to remove the `if
(scorer instanceof IndriScorer)` logic from the IndriScorers. I have added
tests and found that this works as expected now. I have also added the IndriOr
and the IndriWeightedSum scorers as well as an IndriQueryParser to this new PR.
Thank you!
> Add Indri Search Engine Functionality to Lucene
> -----------------------------------------------
>
> Key: LUCENE-9537
> URL: https://issues.apache.org/jira/browse/LUCENE-9537
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Cameron VandenBerg
> Priority: Major
> Labels: patch
> Fix For: 8.9
>
> Attachments: LUCENE-9537.patch, LUCENE-INDRI.patch
>
> Time Spent: 4h 40m
> Remaining Estimate: 0h
>
> Indri ([http://lemurproject.org/indri.php]) is an academic search engine
> developed by The University of Massachusetts and Carnegie Mellon University.
> The major difference between Lucene and Indri is that Indri will give a
> document a "smoothing score" to a document that does not contain the search
> term, which has improved the search ranking accuracy in our experiments. I
> have created an Indri patch, which adds the search code needed to implement
> the Indri AND logic as well as Indri's implementation of Dirichlet Smoothing.
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