mongodb聚合查询，用于将字段转换为子对象

Question

我有一个如下文件

{
  "name" : "test.idsl",
  "files" : "1234.csv",
  "pNames" : "testFilter",
  "success" : 0.0,
  "fail" : 7.0,
  "skip" : 0.0
}

需要将上述文档转换为这样

{
  "name" : "test.idsl",
  "subChild":{
     "files" : "1234.csv",
     "pNames" : "testFilter",
     "success" : 0.0,
     "fail" : 7.0,
     "skip" : 0.0
  }
}

我希望查询能在响应之上执行