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kuromoji_stemmer token filter

The kuromoji_stemmer token filter normalizes common katakana spelling variations ending in a long sound character by removing this character (U+30FC). Only full-width katakana characters are supported.

This token filter accepts the following setting:

minimum_length
Katakana words shorter than the minimum length are not stemmed (default is 4).
 PUT kuromoji_sample { "settings": { "index": { "analysis": { "analyzer": { "my_analyzer": { "tokenizer": "kuromoji_tokenizer", "filter": [ "my_katakana_stemmer" ] } }, "filter": { "my_katakana_stemmer": { "type": "kuromoji_stemmer", "minimum_length": 4 } } } } } } GET kuromoji_sample/_analyze { "analyzer": "my_analyzer", "text": "コピー" } GET kuromoji_sample/_analyze { "analyzer": "my_analyzer", "text": "サーバー" }
  1. Returns コピー.
  2. Return サーバ.