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https://issues.apache.org/jira/browse/LUCENE-8129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16327770#comment-16327770
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ASF subversion and git services commented on LUCENE-8129:
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Commit 6781a0d2d3113e4f423bf717e9c8f781374265ca in lucene-solr's branch
refs/heads/master from Rob Muir
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=6781a0d ]
LUCENE-8129: allow passing filtered unicode sets to ICUFoldingFilter
> Support for defining a Unicode set filter when using ICUFoldingFilter
> ---------------------------------------------------------------------
>
> Key: LUCENE-8129
> URL: https://issues.apache.org/jira/browse/LUCENE-8129
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: Ere Maijala
> Priority: Minor
> Labels: ICUFoldingFilterFactory, patch-available, patch-with-test
> Attachments: LUCENE-8129.patch, LUCENE-8129.patch
>
>
> While ICUNormalizer2FilterFactory supports a filter attribute to define a
> Unicode set filter, ICUFoldingFilterFactory does not support it. A filter
> allows one to e.g. exclude a set of characters from being folded. E.g. for
> Finnish and Swedish the filter could be defined like this:
> <filter class="solr.ICUFoldingFilterFactory" filter="[^åäöÅÄÖ]"/>
> Note: An additional MappingCharFilterFactory or solr.LowerCaseFilterFactory
> would be needed for lowercasing the characters excluded from folding. This is
> similar to what ElasticSearch provides (see
> https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-icu-folding.html).
> I'll add a patch that does this similar to ICUNormalizer2FilterFactory.
> Applies at least to master and branch_7x.
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