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https://issues.apache.org/jira/browse/LUCENE-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13982450#comment-13982450
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Ahmet Arslan commented on LUCENE-5620:
--------------------------------------
After re-reading the description, it looks like you have a different use case.
If I understand it correctly, if we have an example document {{General
Motors}} query {{GENERAL MOTORS}} won't return that document. And you are OK
with that. In other words following field type represents your use case.
{code:xml}
<fieldType name="text_preserve" class="solr.TextField"
positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory" preserveOriginal="true"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
</analyzer>
</fieldType>
{code}
However, I thought that *preserveOriginal* is intended to *boost* documents
that contains original/raw/as-is search terms.
> 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, 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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