Ere Maijala created SOLR-11811:
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Summary: Support for defining a Unicode set filter when using
ICUFoldingFilter
Key: SOLR-11811
URL: https://issues.apache.org/jira/browse/SOLR-11811
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: Schema and Analysis
Reporter: Ere Maijala
Priority: Minor
ne 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 for lowercasing the characters
excluded from folding would be needed for perfect results.)
I'll add a patch that does this similar to ICUNormalizer2FilterFactory. Applies
at least to master and branch_7x.
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