### delete policy
PUT localhost:9200/_opendistro/_ism/policies/exampledelete
Content-Type: application/json

{
  "policy": {
    "description": "Example delete policy.",
    "default_state": "delete",
    "states": [
      {
        "name": "delete",
        "actions": [
          {
            "delete": {}
          }
        ],
        "transitions": []
      }
    ],
    "ism_template": {
      "index_patterns": ["testdelete"],
      "priority": 100
    }
  }
}

### delete index
PUT http://localhost:9200/testdelete
Content-Type: application/json

### explain api call
GET localhost:9200/_plugins/_ism/explain/testdelete?validate_action=true
Accept: application/json