elasticsearch/docs/reference/elasticsearch-plugins/analysis-icu-analyzer.md

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https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-icu-analyzer.html

ICU analyzer [analysis-icu-analyzer]

The icu_analyzer analyzer performs basic normalization, tokenization and character folding, using the icu_normalizer char filter, icu_tokenizer and icu_folding token filter

The following parameters are accepted:

method

Normalization method. Accepts nfkc, nfc or nfkc_cf (default)

mode

Normalization mode. Accepts compose (default) or decompose.