[FEATURE] Manage CCR follower indices

[laszloszurok]

Hi!

I would like to ask if it's possible to properly manage CCR follower indices with ISM. Right now my usecase is the following:

I created different policies for the leader and follower indices.

In the policy for the followers there is only a "default" state and a transition to a "delete" state after 3 days. The deletion fails, because CCR makes the followers readonly. From OpenSearch Dashboards index management UI:

{
    "cause": "index [follower-000001] blocked by: [FORBIDDEN/1000/index read-only(cross-cluster-replication)];",
    "message": "Failed to delete index [follower-000001]"
}

(The leader is deleted already.)

Is there a way to resolve this with ISM?

Here is the current policy for the followers:

{
    "policy": {
        "description": "ism policy",
        "default_state": "default",
        "states": [
            {
                "name": "default",
                "actions": [],
                "transitions": [
                    {
                        "state_name": "delete",
                        "conditions": {
                            "min_index_age": "3d"
                        }
                    }
                ]
            },
            {
                "name": "delete",
                "actions": [
                    {
                        "retry": {
                            "count": 1000,
                            "backoff": "constant",
                            "delay": "10m"
                        },
                        "delete": {}
                    }
                ]

            }
        ],
        "ism_template": {
            "index_patterns": ["follower-*"],
            "priority": 1
        }
    }
}

I saw that there is an 'unfollow' action in elasticsearch ILM for this usecase. Is this functionality planned to be implemented in opensearch?

[Angie-Zhang]

@laszloszurok Thanks for raising this feature request! We see several user cases for ISM with CCR. Our team will discuss and plan it.

[aggarwalShivani]

Hi @Angie-Zhang , @bowenlan-amzn
Is this feature being planned? To add an unfollow action in ISM for ccr follower indices?