Feature Request: Add RBAC support / user management feature

[pakio]

Overview

This is the feature request for supporting RBAC and user management feature on this provider.

Context

Recently Elastic announced that they started providing the RBAC feature on Elasticsearch service. Though this provider is not yet supporting managing the users by code, this is the feature that many users were wanted for a long time and I suppose there are definitely high demand to manage them in a safer way.

[dimuon]

@Kushmaro , I guess this requires adding a dedicated resource to the provider.

[Kushmaro]

Yes @dimuon