[elasticsearch] use new node.roles settings (elastic#1186)

* [elasticsearch] use new node.roles settings

This commit update Elasticsearch chart to use the new node.roles
settings introduced in elastic/elasticsearch#54998.

* [elasticsearch] update doc

* [elasticsearch] update examples

* add link to roles doc

* add workaround for coordinating node

* update roles list

* fixup! update roles list

* remove data_frozen from default roles

this is needed because `data_frozen` role doesn't exist in Elasticsearch < 7.12.0

* fixup! remove data_frozen from default roles

Author: jmlrt