json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "definitions": {
          "version-output": {
              "type": "object",
              "properties": {
                  "_id": {
                      "type": "string"
                  },
                  "database": {
                      "type": "integer"
                  }
              },
              "required": [
                  "_id",
                  "database"
              ]
          }
      },
      "properties": {
          "version-output": {
              "$ref": "#/definitions/version-output"
          }
      },
      "required": [
          "version-output"
      ]
  }