[
  {
    "IndexName": "location",
    "MgoKeySchema": {
      "MgoIndexKeys": [
        {
          "Name": "location",
          "Direction": "2dsphere"
        }
      ],
      "MgoIsUnique": false
    }
  },
  {
    "IndexName": "_add_time",
    "MgoKeySchema": {
      "MgoIndexKeys": [
        {
          "Name": "_add_time",
          "Direction": "1"
        }
      ],
      "MgoIsUnique": false
    }
  }
]