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https://issues.apache.org/jira/browse/LUCENE-4201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408123#comment-13408123
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Robert Muir commented on LUCENE-4201:
-------------------------------------
{quote}
I've indexed the Japanese Wikipedia using this filter and things look okay. I'm
seeing a ~8% performance overhead (versus no filter).
{quote}
Beware of LUCENE-4185 here, it might be not so bad (i just put a patch up there)
> 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, 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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