Some features have been deprecated since `6.0` like the `_parent` field or the ability to have multiple types per index. This allows to remove quite some code, which in-turn will hopefully make it easier to proceed with the removal of types.
Docs: HighLevelRestClient#exists Add documentation for `HighLevelRestClient#exists`. Relates to #28389
With this new structure supported APIs are ordered and grouped in the same way as they are in the Elasticsearch reference docs