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Posted to dev@lucene.apache.org by "Jim Ferenczi (JIRA)" <ji...@apache.org> on 2018/10/05 18:12:00 UTC

[jira] [Created] (LUCENE-8526) StandardTokenizer doesn't separate hangul characters from other non-CJK chars

Jim Ferenczi created LUCENE-8526:
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             Summary: StandardTokenizer doesn't separate hangul characters from other non-CJK chars
                 Key: LUCENE-8526
                 URL: https://issues.apache.org/jira/browse/LUCENE-8526
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Jim Ferenczi


It was first reported here https://github.com/elastic/elasticsearch/issues/34285.
I don't know if it's the expected behavior but the StandardTokenizer does not split words
which are composed of a mixed of non-CJK characters and hangul syllabs. For instance "한국2018" or "한국abc" is kept as is by this tokenizer and mark as an alpha-numeric group. This breaks the CJKBigram token filter which will not build bigrams on such groups. The other CJK characters are correctly splitted when they are mixed with other alphabet so I'd expect the same for hangul.



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