Index lifecycle error - index.lifecycle.rollover_alias syntax

[AClerk]

Hey All,
Can someone help me with the syntax required?
Or maybe I am missing something else?
I got this error on the indices.

This is my ILM policy below. How should I add the alias part?

PUT _ilm/policy/ilm-36-hours-deletion-my-index
{
  "policy": {
    "phases": {
      "hot": {
        "min_age": "0ms",
        "actions": {
          "rollover": {
            "max_size": "40gb"
          },
          "set_priority": {
            "priority": null
          }
        }
      },
      "delete": {
        "min_age": "36h",
        "actions": {
          "delete": {
            "delete_searchable_snapshot": true
          }
        }
      }
    }
  }
}

Thanks!

[AClerk]

index template

{
  "index": {
    "lifecycle": {
      "name": "ilm-36-hours-deletion-my-index",
      "rollover_alias": "monitoring--my-index-alias"
    },
    "number_of_shards": "1",
    "number_of_replicas": "1"
  }
}

[AClerk]

From Kibana UI

Looks like rollover_alias is defined?!

[warkolm (Mark Walkom)]

It goes in the template you have it. But is it attached to the existing indices?

[AClerk]

The first error attached is from the index management module.
So the template is attached to a few indices, but throwing an error.
Thanks!