[BUG] Visual ISM policy editor does not support stop_replication action

[wzyns]

What is the bug?
The ISM visual policy editor does not support the documented stop_replication action.

The action is missing from the action type dropdown. Also, policies containing { "stop_replication": {} } can fail to load in the visual editor because the action repository does not recognize the action type.

How can one reproduce the bug?

1. Create or edit an ISM policy using the JSON editor.
2. Add an action:

   { "stop_replication": {} }

3. Save the policy.
4. Open the same policy in the visual editor.
5. The visual editor cannot load the policy, or the action is unavailable in the action dropdown.

What is the expected behavior?
The visual editor should support stop_replication as a no-configuration ISM action and preserve the payload as:

{ "stop_replication": {} }

What is your host/environment?

• OpenSearch Dashboards: main / 3.x
• Plugin: index-management-dashboards-plugin main
• OpenSearch: 3.x

Do you have any additional context?
OpenSearch ISM documentation lists stop_replication as a supported action:
https://docs.opensearch.org/latest/im-plugin/ism/policies/#stop_replication

Related forum thread:
https://forum.opensearch.org/t/policy-action-to-stop-replication/24675

[wzyns]

Additional reproduction detail:

1. Create a new ISM policy using the JSON editor. Paste the following policy JSON:

{
    "policy": {
        "policy_id": "test_stop_replication_action",
        "description": "Test policy for stop_replication action before delete",
        "last_updated_time": 1780237850801,
        "schema_version": 27,
        "error_notification": null,
        "default_state": "stop_replication",
        "states": [
            {
                "name": "stop_replication",
                "actions": [
                    {
                        "retry": {
                            "count": 3,
                            "backoff": "exponential",
                            "delay": "1m"
                        },
                        "stop_replication": {}
                    }
                ],
                "transitions": [
                    {
                        "state_name": "delete"
                    }
                ]
            },
            {
                "name": "delete",
                "actions": [
                    {
                        "retry": {
                            "count": 3,
                            "backoff": "exponential",
                            "delay": "1m"
                        },
                        "delete": {}
                    }
                ],
                "transitions": []
            }
        ],
        "ism_template": null
    }
}

2. Save the policy.
3. Open the saved policy in the visual editor.

[wzyns]

I’ve opened a PR for this issue: #1438
Any review or feedback would be appreciated. Thank you!