[ResponseOps] Error trying to update a rule created in 7.17 in 8.x

[doakalexi]

I am not sure if this is a bug but it seem unexpected. I created an ES query rule in 7.17 and upgraded from 7.17 -> 8.15 -> 8.x. I tried to edit is above in the rule from 1000 to 0, and I got the following error.

Here is the request when I click show request in the rule form:

PUT kbn:/api/alerting/rule/a0747ea0-de6f-11ef-b1e2-35d05b76fe70
{
  "name": "es query",
  "tags": [],
  "schedule": {
    "interval": "1m"
  },
  "params": {
    "esQuery": "{\n  \"query\":{\n    \"match_all\" : {}\n  }\n}",
    "size": 100,
    "timeWindowSize": 5,
    "timeWindowUnit": "d",
    "threshold": [
      0
    ],
    "thresholdComparator": ">",
    "index": [
      "kibana_sample_data_logs"
    ],
    "timeField": "@timestamp",
    "searchType": "esQuery",
    "aggType": "count",
    "groupBy": "all",
    "termSize": 5,
    "excludeHitsFromPreviousRun": false,
    "sourceFields": []
  },
  "actions": [
    {
      "group": "query matched",
      "id": "9aef87e0-de6f-11ef-b1e2-35d05b76fe70",
      "params": {
        "level": "info",
        "message": "Elasticsearch query alert '{{alertName}}' is active:\n\n- Value: {{context.value}}\n- Conditions Met: {{context.conditions}} over {{params.timeWindowSize}}{{params.timeWindowUnit}}\n- Timestamp: {{context.date}}"
      },
      "uuid": "705e5ba7-8a53-4498-8064-fbc1f9a26f3f"
    }
  ],
  "alert_delay": {
    "active": 1
  }
}

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)