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https://issues.apache.org/jira/browse/LUCENE-3901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235497#comment-13235497
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Christian Moen commented on LUCENE-3901:
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Patch for this coming up shortly.
> Add katakana stem filter to better deal with certain katakana spelling
> variants
> -------------------------------------------------------------------------------
>
> Key: LUCENE-3901
> URL: https://issues.apache.org/jira/browse/LUCENE-3901
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Christian Moen
> Fix For: 3.6, 4.0
>
>
> Many Japanese katakana words end in a long sound that is sometimes optional.
> For example, パーティー and パーティ are both perfectly valid for "party". Similarly
> we have センター and センタ that are variants of "center" as well as サーバー and サーバ
> for "server".
> I'm proposing that we add a katakana stemmer that removes this long sound if
> the terms are longer than a configurable length. It's also possible to add
> the variant as a synonym, but I think stemming is preferred from a ranking
> point of view.
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