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https://issues.apache.org/jira/browse/LUCENE-6737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032677#comment-15032677
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Uwe Schindler commented on LUCENE-6737:
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Ignore my last comment: The filter needs more Unicode info than
Character#isDigit().
> Add DecimalDigitFilter
> ----------------------
>
> Key: LUCENE-6737
> URL: https://issues.apache.org/jira/browse/LUCENE-6737
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Robert Muir
> Fix For: Trunk, 5.4
>
> Attachments: LUCENE-6737.patch
>
>
> TokenFilter that folds all unicode digits
> (http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[:General_Category=Decimal_Number:])
> to 0-9.
> Historically a lot of the impacted analyzers couldn't even tokenize numbers
> at all, but now they use standardtokenizer for numbers/alphanum tokens. But
> its usually the case you will find e.g. a mix of both ascii digits and
> "native" digits, and today that makes searching difficult.
> Note this only impacts *decimal* digits, hence the name DecimalDigitFilter.
> So no processing of chinese numerals or anything crazy like that.
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