jolt transform combine

{
  "attrFields": {
    "attribute_1": "International aid/development worker",
    "attribute_2": 3762,
    "attribute_3": "B-",
    "attribute_4": "Scott-Mendoza",
    "attribute_5": "M",
    "attribute_6": "2007-01-09",
    "attribute_7": 8.302579812
  },
  "token": "0x6af91012208543d"
}

to 


{
  "token" : "0x6af91012208543d",
  "attribute_1" : "International aid/development worker",
  "attribute_2" : 3762,
  "attribute_3" : "B-",
  "attribute_4" : "Scott-Mendoza",
  "attribute_5" : "M",
  "attribute_6" : "2007-01-09",
  "attribute_7" : 8.302579812
}

using

[
  {
    "operation": "shift",
    "spec": {
      "token": "token",
      "attrFields": {
        "*": "&"
      }
    }
  }
]