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elasticsearch/docs/reference/elasticsearch-plugins/analysis-kuromoji-hiragana-uppercase.md
Colleen McGinnis b7e3a1e14b
[docs] Migrate docs from AsciiDoc to Markdown (#123507) 
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* Clarify release notes page titles

* Revert "Clarify release notes page titles"

This reverts commit 8be688648d.

* Comment out edternal URI images

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* Fixes inference processor nesting.

---------

Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: István Zoltán Szabó <szabosteve@gmail.com>
2025-02-27 17:56:14 +01:00

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https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-kuromoji-hiragana-uppercase.html

hiragana_uppercase token filter [analysis-kuromoji-hiragana-uppercase]

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"
}

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
    }
  ]
}