IcuCollationTokenFilter requires bunch of parameters that are not required on server side

[Enerccio]

Java API client version

8.2.3

Java version

1.8

Elasticsearch Version

8.2.3

Problem description

Serverside icu_collation does not require many parameters, for instance we only use language and country. However, when trying to use builder in java api you have to specify ALL properties, even those which are listed as "expert" in the manual (https://www.elastic.co/guide/en/elasticsearch/plugins/master/analysis-icu-collation-keyword-field.html) or you end with exception such as co.elastic.clients.util.MissingRequiredPropertyException: Missing required property 'IcuCollationTokenFilter.casefirst'.

[Enerccio]

Same with PatternTokenizer. Why are there checks for this when they are optional?

[Enerccio]

Also there is wrong decomposition enum Identical.

co.elastic.clients.elasticsearch._types.ElasticsearchException: [es/indices.create] failed: [illegal_argument_exception] Invalid decomposition: identical