FieldUpdateOperation

{
    "add": "triaged",
    "copy": {
        "issuelinks": {
            "sourceIssues": [
                {
                    "key": "FP-5"
                }
            ]
        }
    },
    "edit": {
        "originalEstimate": "1w 1d",
        "remainingEstimate": "4d"
    },
    "remove": "blocker",
    "set": "A new summary"
}