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https://issues.apache.org/jira/browse/SOLR-17757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18049075#comment-18049075
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parveen saini commented on SOLR-17757:
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Since this behavior is owned by Lucene, I’ve opened a Lucene issue to confirm
intent and ask about documentation/upgrade guidance:
[https://github.com/apache/lucene/issues/15547]
I’ll follow up here once there’s confirmation or guidance from the Lucene side.
> TFIDFSimilarity scoring difference between version 5.5.4 and 8.9.0
> ------------------------------------------------------------------
>
> Key: SOLR-17757
> URL: https://issues.apache.org/jira/browse/SOLR-17757
> Project: Solr
> Issue Type: Bug
> Components: search
> Reporter: parveen saini
> Priority: Critical
> Labels: TFIDF, similarity
> Attachments: image-2025-06-04-23-42-47-309.png,
> image-2025-06-04-23-42-47-382.png
>
>
> On migrating solr version from 5.5.4 to 8.9.0 I noticed that TFIDFSimilarity
> scoring is different and results in different overall score for the query.
> On digging deeper I found idf is factored twice in version 5.5.4 which is
> causing the issue. Is the change in version 8.9.0 intentional?
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