Error "Panic in job" - Unable to monitor my service

Elastic Stack Beats
7

The response would be like below, but for a valid check, only need to seek for "error": null.

body: '{"error" : null*}' doesn't work as expected. How to set correctly for matching above requirements?

{
  "error" : null,
  "results" : [ {
    "Id" : {
      "id" : "46245745375425",
      "metadata" : { },
      "valid" : true
    },
    "key" : {
      "Type" : "grok.DerivedMktDataUFO.YieldCurveKey",
      "currently" : "U",
      "cType" : "Q",
      "frequency" : "2s",
      "index" : "X2"
    },
    "objectType" : "834721935598",
    "subTag" : "Ldn",
    "tag" : "wfawfd0213",
    "transId" : "R922ff942",
    "updatedBy" : "sdsdfid",
    "userId" : "adsfghgh",
    "validFrom" : "2020-02-13T19:33:46.574",
    "validTo" : "2030-01-01T00:00:00.000"
  } ]
}