[
  {
    "operation": "shift",
    "spec": {
      "rating": {
        "*": {
          "max": "Rating.[#2].amx",//左边rating.*.max ： 右边：Rating[{max:5}]
          "value": "Rating.[#2].value"//左边rating.*.value：右边：Rating[{value:3}]
        }
      }
    }
  }
]

//[#2]代表生成数组