[jira] [Created] (LUCENE-9929) Make ScandinavianNormalizationFilter configurable wrt foldings

["Jan Høydahl (Jira)" <ji...@apache.org>]

Jan Høydahl created LUCENE-9929:
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             Summary: Make ScandinavianNormalizationFilter configurable wrt foldings
                 Key: LUCENE-9929
                 URL: https://issues.apache.org/jira/browse/LUCENE-9929
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/analysis
            Reporter: Jan Høydahl
            Assignee: Jan Høydahl


The ScandinavianNormalizationFilter applies foldings for aa, ao, ae, oe and oo. But all those five do not make sense for both Norwegian, Swedish and Danish. Implement a configuration option where users can select which of them to apply.

I.e. for Norwegian, a user would then configure (in Solr):
{code:java}
<filter class="solr.ScandinavianNormalizationFilterFactory foldings="ae,oe,aa"/>
{code}
This would activate foldings for ae->æ, oe->ø, aa->å, but not oo->o and ao->a.



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