Event ID 4121 —

{
  "system": {
    "provider": "Microsoft-Windows-Search",
    "guid": "{CA4E628D-8567-4896-AB6B-835B221F373F}",
    "event_source_name": "Windows Search Service",
    "event_id": 4121,
    "version": 0,
    "level": 4,
    "task": 1,
    "opcode": 0,
    "keywords": 36028797018963968,
    "time_created": "2014-11-26T23:22:14.000000Z",
    "event_record_id": 1157,
    "correlation": {},
    "execution": {
      "process_id": 0,
      "thread_id": 0
    },
    "channel": "Application",
    "computer": "IE10Win7",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "ExtraInfo": "\n",
    "CatalogName": "SystemIndex"
  }
}