message: remove unnecessary additional properties
diff: "x-ms-client-flatten": true,
  "$ref": "#/definitions/FlowletTypeProperties"
  }
  - },
  - "additionalProperties": {
  - "type": "object"
  }
  },
  "MappingDataFlowTypeProperties": {
  "items": {
  "type": "string"
  }
  - },
  - "additionalProperties": {
  - "type": "object"
  }
  }
  },
  