[jira] [Updated] (LUCENE-9410) German/French stemmers fail for common forms maux, gegrüßt, grüßend, schlummert

["Ben Kazez (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-9410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ben Kazez updated LUCENE-9410:
------------------------------
    Priority: Critical  (was: Major)

> German/French stemmers fail for common forms maux, gegrüßt, grüßend, schlummert
> -------------------------------------------------------------------------------
>
>                 Key: LUCENE-9410
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9410
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/analysis
>    Affects Versions: 8.5
>         Environment: Elasticsearch 7.7.1 running on cloud.elastic.co
>            Reporter: Ben Kazez
>            Priority: Critical
>              Labels: french, german, stemmer, stemming
>
> I'm using Lucene via Elasticsearch 7.7.1. German and French stemmers (either via the Snowball analyzer, or the "light" or "heavy" stemming analyzers) are failing to understand some common forms:
> French:
>   - "maux" (plural) should match "mal" (singular) but instead "maux" is unchanged
> German:
>   - "schlummert" should match "schlummern" (infinitive) but instead is unchanged
>   - "grüßend" should match "grüßen" (infinitive) but instead yields "grussend"
>   - "gegrüßt"  should match "grüßen" (infinitive) but instead yields "gegrusst"
> The Elasticsearch folks [said|https://discuss.elastic.co/t/better-french-and-german-stemming/236283] I should file a bug with Lucene.



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