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https://issues.apache.org/jira/browse/LUCENE-4201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408106#comment-13408106
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Christian Moen commented on LUCENE-4201:
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I've indexed the Japanese Wikipedia using this filter and things look okay.
I'm seeing a ~8% performance overhead (versus no filter).
My thinking is that this filter should be available for applications that need
it, but it should not be part of our default Japanese configuration.
> Add Japanese character filter to normalize iteration marks
> ----------------------------------------------------------
>
> Key: LUCENE-4201
> URL: https://issues.apache.org/jira/browse/LUCENE-4201
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/analysis
> Affects Versions: 4.0, 5.0
> Reporter: Christian Moen
> Attachments: LUCENE-4201.patch
>
>
> For some applications it might be useful to normalize kanji and kana
> iteration marks such as 々, ゞ, ゝ, ヽ and ヾ to make sure they are treated
> uniformly.
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