Jolt tranformation merge records

Question

facing one issue with Jolt -

Current input -

[
  {
    "test1": "A",
    "test2": "X",
    "test3": "Y",
    "test4": "Z"
  },
  {
    "test1": "B",
    "test2": "X",
    "test3": "Y",
    "test4": "Z"
  }
]

Output required is

[
  {
    "test1": "A",
    "label": [
      {
        "test2": "X",
        "test3": "Y",
        "test4": "Z"
      }
    ]
  },
  {
    "test1": "B",
    "label": [
      {
        "test2": "X",
        "test3": "Y",
        "test4": "Z"
      }
    ]
  }
]

Basically to merge the three attributes under one and the rest one should be outside

Tried with below Jolt but not working -

[
  {
    "operation": "shift",
    "spec": {
      "test1": "&",
      "*": "row.&"
    }
  }
]

Answer 1

You can prepend the values of the attributes other than test1 by label[0] while distinguishing objects by prepending &1 as the leading in order to substitute the indexes of them element such as

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "test1": "&1.&",
        "*": "&1.label[0].&"
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": ""
    }
  }
]

the demo on the site http://jolt-demo.appspot.com/ is :