[
https://issues.apache.org/jira/browse/SOLR-17757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18052557#comment-18052557
]
parveen saini commented on SOLR-17757:
--------------------------------------
Following up to close the loop here.
The observed behavior is consistent with intentional Lucene scoring changes
accumulated across major versions rather than a Solr regression. I’ve opened a
documentation [PR|https://github.com/apache/lucene/pull/15586] on the Lucene
side to clarify this upgrade consideration and point users toward custom
{{Similarity}} when strict backward ranking compatibility is required.
Thanks for the earlier discussion — this issue can be considered resolved from
my 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?
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
