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https://issues.apache.org/jira/browse/LUCENE-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974916#comment-13974916
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Ahmet Arslan commented on LUCENE-5620:
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bq. but other than that I don't know which other filters would be likely
targets for this kind of enhancement.
Please see : https://issues.apache.org/jira/browse/SOLR-5332
bq. Its too complicated for all of our analyzers to have to have
preserveOriginal options.
I agree with this. Any token filter that modifies its input could be a
candidate. e.g. TurkishLowerCaseFilter.
How about making these candidate filters (may be all) respect to
KeywordAttribute. And simulating preserve original behavior with
{{KeywordRepeatFilter}}?
{code:xml}
<filter class="solr.KeywordRepeatFilterFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
{code}
> LowerCaseFilter.preserveOriginal
> --------------------------------
>
> Key: LUCENE-5620
> URL: https://issues.apache.org/jira/browse/LUCENE-5620
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Mike Sokolov
> Attachments: LUCENE-5620.patch
>
>
> Following closely the model of LUCENE-5437 (which worked on
> ASCIIFoldingFilter), this patch adds the ability to preserve the original
> token to LowerCaseFilter. This is useful if you want an all-lowercase search
> term to match without regard to case, while search terms with uppercase
> letters match in a case-sensitive manner.
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