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Elastic Docs ›Elasticsearch Guide [2.1] ›Analysis ›Token Filters

CJK Width Token Filter

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CJK Width Token Filter

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The cjk_width token filter normalizes CJK width differences:

  • Folds fullwidth ASCII variants into the equivalent basic Latin
  • Folds halfwidth Katakana variants into the equivalent Kana

This token filter can be viewed as a subset of NFKC/NFKD Unicode normalization. See the ICU Analysis Plugin for full normalization support.

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