Fixing indices create partially

[l-trotta]

The missing validated tests are either:

• wrong tests IMO, will provide a fix in the flight recorder
• new features (bbq_ivf is still very experimental, since even the name could change I don't think it should be added yet)
• validation bugs

Details:

• IcuCollationTokenFilter's fields are actually snakeCase and not camel_case -> server code
• HunspellTokenFilter: locale has two aliases, and if it's set as mandatory as it was before, this means that the generator will generate 3 mandatory fields. For now I'm setting this as optional, but maybe we should support this as a feature?
• PatternReplaceTokenFilter was missing the flags field -> server code
• In EdgeNGramTokenizer, token_chars can also be expressed as a csv, so making it a string | enum union
• RankVectorProperty was missing -> server code
• FlattenedProperty was missing time_series_dimensions -> server code
• AggregateMetricDoubleProperty was missing ignore_malformed -> server code
• GeoPointProperty was missing time_series_metric -> server code
• Storage in IndexSettings was missing stats_refresh_interval, but I also noticed that in the code and yaml tests there was no trace of the type field, nor the StorageType enum, so maybe we can remove that. -> server code

[github-actions]

Following you can find the validation changes for the APIs you have modified.

API	Status	Request	Response
indices.create	🔴	1184/1235 → 1209/1235	1235/1235
indices.get_settings	🔴	76/76	57/76 → 73/76
indices.put_mapping	🔴	128/132 → 129/132	135/135

You can validate these APIs yourself by using the make validate target.

[github-actions]

Following you can find the validation changes for the APIs you have modified.

API	Status	Request	Response
indices.create	🔴	1186/1240 → 1211/1240	1240/1240
indices.get_settings	🔴	76/76	57/76 → 73/76
indices.put_mapping	🔴	128/132 → 129/132	135/135

You can validate these APIs yourself by using the make validate target.