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https://issues.apache.org/jira/browse/LUCENE-5369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849374#comment-13849374
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Robert Muir commented on LUCENE-5369:
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My only thoughts are the usual ones: to me the analysis chain is not really the
best tool to do the job of cleaning up faceting labels?
These tasks typically dont require tokenization and work on whole values, and
may require stuff like extracting values from one field into another. While its
true you can do some of this cleanup (casing/trimming,etc) in the analysis
chain by (ab)using the fact that fieldcache uninverts indexed values and using
keywordtokenizer and using filters like this, its not very intuitive, and you
can't do all of it, whereas using something like solr's updateprocessor chain
might be a better place to have this support. There is already overlap, e.g. it
can trim field contents as well.
> Add an UpperCaseFilter
> ----------------------
>
> Key: LUCENE-5369
> URL: https://issues.apache.org/jira/browse/LUCENE-5369
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Ryan McKinley
> Assignee: Ryan McKinley
> Priority: Minor
> Attachments: LUCENE-5369-uppercase-filter.patch
>
>
> We should offer a standard way to force upper-case tokens. I understand that
> lowercase is safer for general search quality because some uppercase
> characters can represent multiple lowercase ones.
> However, having upper-case tokens is often nice for faceting (consider
> normalizing to standard acronyms)
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