Merging two arrays using one common key

[Vignesh-Muthusamy05]

Hi, I am stuck in generating an array with fields from two different arrays which share a common key. When the common key's value is the same in both array elements, it has to be merged. Below is the sample Input and Output JSON. Please help me in writing a JOLT spec for this scenario. Your help is much appreciated!

Input JSON
{
"parentArray": [
{
"array1": [
{
"field1": "1008",
"field2": "b1111"
},
{
"field1": "2345",
"field2": "b2222"
}
],
"array2": [
{
"field1": "1008"
},
{
"field1": "3210"
}
]
}
]
}

Output JSON
{
"parentResultArray": [{
"resultArray": [{
"field1": "1008",
"jsonObject": {
"field2": "b1111"
}
}]
}]
}

[gbouget]

Is it possible that there are also values in array2? If not, this solution should be suitable:

[
  { // Creation of arrayTmp to index field1 values in array1
    "operation": "shift",
    "spec": {
      "parentArray": {
        "*": {
          "array1": {
            "*": {
              "field1": "arrayTmp.@0.&",
              "*": "arrayTmp.@(1,field1).jsonObject.&"
            }
          },
          "array2": {
            "*": {
              "*": "&2[&1].&"
            }
          }
        }
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "array2": {
        "*": {
          "field1": {
            "*": { // value of field1
              "@(5,arrayTmp.&)": "resultArray[]" // & refers to value field1
                                                 // @5 moves up 5 levels to reach root node
            }
          }
        }
      }
    }
  }
]