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---------

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-icu-normalization.html

ICU normalization token filter [analysis-icu-normalization]

Normalizes characters as explained here. It registers itself as the icu_normalizer token filter, which is available to all indices without any further configuration. The type of normalization can be specified with the name parameter, which accepts nfc, nfkc, and nfkc_cf (default).

Which letters are normalized can be controlled by specifying the unicode_set_filter parameter, which accepts a UnicodeSet.

You should probably prefer the Normalization character filter.

Here are two examples, the default usage and a customised token filter:

PUT icu_sample
{
  "settings": {
    "index": {
      "analysis": {
        "analyzer": {
          "nfkc_cf_normalized": { <1>
            "tokenizer": "icu_tokenizer",
            "filter": [
              "icu_normalizer"
            ]
          },
          "nfc_normalized": { <2>
            "tokenizer": "icu_tokenizer",
            "filter": [
              "nfc_normalizer"
            ]
          }
        },
        "filter": {
          "nfc_normalizer": {
            "type": "icu_normalizer",
            "name": "nfc"
          }
        }
      }
    }
  }
}
  1. Uses the default nfkc_cf normalization.
  2. Uses the customized nfc_normalizer token filter, which is set to use nfc normalization.