[BUG] ISM doesn't work with datastreams

[houska2]

What is the bug?
Simple ISM policy doesnt work with datastreams
I asked in forum and reply was to open this report

How can one reproduce the bug?
This policy should delete older datastreams.

{
    "id": "delete_after_7_days",
    "seqNo": 66941,
    "primaryTerm": 1,
    "policy": {
        "policy_id": "delete_after_7_days",
        "description": "Policy to delete indices older than 7 days",
        "last_updated_time": 1718804887897,
        "schema_version": 21,
        "error_notification": null,
        "default_state": "hot",
        "states": [
            {
                "name": "hot",
                "actions": [],
                "transitions": [
                    {
                        "state_name": "delete",
                        "conditions": {
                            "min_index_age": "7d"
                        }
                    }
                ]
            },
            {
                "name": "delete",
                "actions": [
                    {
                        "retry": {
                            "count": 3,
                            "backoff": "exponential",
                            "delay": "1m"
                        },
                        "delete": {}
                    }
                ],
                "transitions": []
            }
        ],
        "ism_template": [
            {
                "index_patterns": [
                    "*nonp_app*",
                    "*nonp_system*",
                    "*security-auditlog*"
                ],
                "priority": 2,
                "last_updated_time": 1718797014932
            }
        ]
    }
}

What is the expected behavior?
A clear and concise description of what you expected to happen.

What is your host/environment?
Debian opensearch 2.14.0

Do you have any screenshots?

Do you have any additional context?
Add any other context about the problem.

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