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`.

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