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https://issues.apache.org/jira/browse/LUCENE-9537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200370#comment-17200370
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Adrien Grand commented on LUCENE-9537:
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Sorry, this might be a very naive question, but would associating a smoothing
score to documents when they don't match a term essentially have the same
effect as subtracting this smoothing score whenever a document contains a term,
and the absolute scores would be different but the ordering of hits would
remain the same? I'm asking because the fact that terms that don't match don't
contribute a score is hardcoded into Lucene so if there were other ways we
could achieve the same effect, it might be easier to integrate.
> 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
> Attachments: LUCENE-INDRI.patch
>
>
> 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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