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https://issues.apache.org/jira/browse/LUCENE-8353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16509321#comment-16509321
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Adrien Grand commented on LUCENE-8353:
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This stemmer is borrowed from work from Jacques Savoy
(http://members.unine.ch/jacques.savoy/clef/frenchStemmerPlus.txt) so we would
diverge from it though I can't think of a reason to not do it, especially given
the name of the function.
I wonder how best to handle backward compatibility for existing indices here.
Maybe we could fork the stemmer into a new class that has your changes,
deprecate the old one, and make FrenchLightStemmerFactory use the new one
depending on {{getLuceneMatchVersion}}. Another option could be to add a
version parameter to the constructor but it proved problematic in the past
(LUCENE-5859). Could you also put comments that make it clear where this
stemmer differs from the original one?
> FrenchLightStemmer dont work with ë, ö and ï
> --------------------------------------------
>
> Key: LUCENE-8353
> URL: https://issues.apache.org/jira/browse/LUCENE-8353
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: Bruno CAILLAUD
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> ë, ö and ï are not present in FrenchLightStemmer so if you search per exemple
> Laicité when you index contains Laïcité, that's not match
> I try to fixe this issue in https://github.com/apache/lucene-solr/pull/379
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