我正在尝试编写一个规范来使用jolt转换进行以下转换。我需要通过保持空值将平面JSON转换为嵌套JSON。我附加了输入、预期输出和jolt转换。我需要在输出中保留空值，但在jolt转换后不会显示在输出中。我的jolt转换没有得到确切的输出。

我在将平面JSON转换为嵌套JSON时遇到了一些问题。我看了一些例子，但没有更进一步了解上面提到的内容。我需要通过使用JOLT规范来转换JSON结构。我用https://jolt-demo.appspot.com来测试以下内容。

输入：

[
  {
    "container_id": "ABC",
    "shipperN": null,
    "PNumber": null,
    "trackingNumber": null,
    "priority": null,
    "HType": "IN_Load",
    "loadNumber": "123345",
    "billOfLading": "12345",
    "referenceNumbers": "LID",
    "addressLine1": "ABC Street",
    "addressLine2": "null",
    "city": "Chicago",
    "country": "US",
    "latitude": "null",
    "longitude": "null",
    "earliestAppointmentTime": "XXXXX09:25",
    "latestAppointmentTime": "XXXXX09:25",
    "postalCode": "XXXXX3",
    "sequence": "1",
    "state": "XY",
    "stopReferenceId": "0001",
    "stopType": "PU",
    "truckNumber": null,
    "trailerNumber": null,
    "driverPhone": null,
    "railEquipmentInitials": null,
    "railEquipmentNumber": null,
    "containerNumber": "XXXXXXXX"
  },
  {
    "container_id": "ABC",
    "shipperN": null,
    "PNumber": null,
    "trackingNumber": null,
    "priority": null,
    "HType": "IN_Load",
    "loadNumber": "123345",
    "billOfLading": "12345",
    "referenceNumbers": "LID",
    "addressLine1": "null",
    "addressLine2": "null",
    "city": "null",
    "country": "null",
    "latitude": null,
    "longitude": null,
    "earliestAppointmentTime": "XXXXX09:25",
    "latestAppointmentTime": "XXXXX09:25",
    "name": "null",
    "postalCode": "null",
    "sequence": "2",
    "state": "null",
    "stopReferenceId": "XXXXD",
    "stopType": "PL",
    "truckNumber": null,
    "trailerNumber": null,
    "driverPhone": null,
    "railEquipmentInitials": null,
    "railEquipmentNumber": null,
    "containerNumber": "XXXXXXXX"
  }
]

期望输出：

{
  "load": {
    "container_id": "ABC",
    "shipperN": null,
    "PNumber": null,
    "trackingNumber": null,
    "priority": null,
    "HType": [ "IN_Load" ],
    "loadNumber": "123345",
    "billOfLading": "12345",
    "referenceNumbers": [ "LID" ],
    "stops": [
      {
        "addressLine1": "ABC Street",
        "addressLine2": "null",
        "city": "Chicago",
        "country": "US",
        "earliestAppointmentTime": "XXXXX09:25",
        "latestAppointmentTime": "XXXXX09:25",
        "postalCode": "XXXXX3",
        "sequence": "1",
        "state": "XY",
        "stopReferenceId": "0001",
        "stopType": "PU"
      },
      {
        "earliestAppointmentTime": "2021-03-09T15:25:00.203Z",
        "latestAppointmentTime": "2021-03-09T15:25:00.203Z",
        "sequence": "2",
        "stopReferenceId": "dummy",
        "stopType": "PL",
        "externalAddressId": "dummy"
      }
    ]
  },
  "containerInfo": {
    "containerNumber": "XXXXXXXX"
  },
  "trackingInfo": {
    "truckNumber": null,
    "trailerNumber": null,
    "driverPhone": null,
    "railEquipmentInitials": null,
    "railEquipmentNumber": null
  }
}

我使用的Jolt Spec：

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "*": "@(1,container_id).load.stops[&1].&",
        "container_id": "@(1,container_id).load.&", // "else" case
        "shipperN": "@(1,container_id).load.&",
        "PNumber": "@(1,container_id).load.&",
        "trackingNumber": "@(1,container_id).load.&",
        "priority": "@(1,container_id).load.&",
        "HType": "@(1,container_id).load.&",
        "loadNumber": "@(1,container_id).load.&",
        "billOfLading": "@(1,container_id).load.&",
        "referenceNumbers": "@(1,container_id).load.&",
        "containerNumber": "@(1,container_id).containerInfo.&",
        "truckNumber": "@(1,container_id).trackingInfo.&",
        "trailerNumber": "@(1,container_id).trackingInfo.&",
        "driverPhone": "@(1,container_id).trackingInfo.&",
        "railEquipmentInitials": "@(1,container_id).trackingInfo.&",
        "railEquipmentNumber": "@(1,container_id).trackingInfo.&"
      }
    }
  },
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": "=recursivelySquashNulls"
    }
  },
  {
    "operation": "cardinality",
    "spec": {
      "*": {
        "*": {
          "container_id": "ONE",
          "shipperN": "ONE",
          "PNumber": "ONE",
          "trackingNumber": "ONE",
          "priority": "ONE",
          "HType": "ONE",
          "referenceNumbers": "ONE",
          "loadNumber": "ONE",
          "billOfLading": "ONE",
          "containerInfo": {
            "*": "ONE"
          },
          "trackingInfo": {
            "*": "ONE"
          }
        }
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": ""
    }
  }
]