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« kuromoji_number token filter katakana_uppercase token filter »
Elastic Docs ›Elasticsearch Plugins and Integrations [8.17] ›Analysis plugins ›Japanese (kuromoji) analysis plugin

hiragana_uppercase token filter

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hiragana_uppercase token filter

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The hiragana_uppercase token filter normalizes small letters (捨て仮名) in hiragana into standard letters. This filter is useful if you want to search against old style Japanese text such as patents, legal documents, contract policies, etc.

For example:

PUT kuromoji_sample
{
  "settings": {
    "index": {
      "analysis": {
        "analyzer": {
          "my_analyzer": {
            "tokenizer": "kuromoji_tokenizer",
            "filter": [
              "hiragana_uppercase"
            ]
          }
        }
      }
    }
  }
}

GET kuromoji_sample/_analyze
{
  "analyzer": "my_analyzer",
  "text": "ちょっとまって"
}
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Which results in:

{
  "tokens": [
    {
      "token": "ちよつと",
      "start_offset": 0,
      "end_offset": 4,
      "type": "word",
      "position": 0
    },
    {
      "token": "まつ",
      "start_offset": 4,
      "end_offset": 6,
      "type": "word",
      "position": 1
    },
    {
      "token": "て",
      "start_offset": 6,
      "end_offset": 7,
      "type": "word",
      "position": 2
    }
  ]
}
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