Rollover errors for .kibana-reporting datastream indexes

Elastic Stack Kibana
1

8.18.3

indexes going back over a year for .kibana-reporting datastream have rollover errors:

"setting [index.lifecycle.rollover_alias] for index [.reporting-2024-04-07] is empty or not defined"

{
  "policy": "kibana-reporting",
  "phase_definition": {
    "min_age": "0ms",
    "actions": {
      "rollover": {
        "max_age": "30d",
        "min_docs": 1,
        "max_primary_shard_docs": 200000000,
        "max_primary_shard_size": "1gb"
      }
    }
  },
  "version": 3,
  "modified_date_in_millis": 1754258741898
}

in setting:

"rollover_alias": "",

These indexes are not listed under the datastream view, i.e. not part of the current datastream.

I tried to delete the indexes from kibana (user elastic, role super user) but I get error:

action [indices:admin/delete] is unauthorized for user [elastic] with effective roles [superuser] on restricted indices [.reporting-2024-04-07], this action is granted by the index privileges [delete_index,manage,all]

How should I proceed?