message: OperationMode fix
diff: "properties": {
  "operationMode": {
  "type": "string",
  - "description": "The type of Import/Export operation being performed",
  + "description": "The type of Import/Export operation being performed. This is always Import.",
  "enum":["Import"],
  "x-ms-enum":{
  "name": "OperationMode"
  }
  }
  },
  + "required": ["operationMode"],
  "allOf": [
  {
  "$ref": "#/definitions/ExportRequestParameters"
  