fields or update parameters in the request body. Get details about the fields using  Get transitions with the transitions.fields expand.curl --location --request POST '/rest/api/3/issue//transitions' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fields": {
        "assignee": {
            "name": "bob"
        },
        "resolution": {
            "name": "Fixed"
        }
    },
    "historyMetadata": {
        "activityDescription": "Complete order processing",
        "actor": {
            "avatarUrl": "http://mysystem/avatar/tony.jpg",
            "displayName": "Tony",
            "id": "tony",
            "type": "mysystem-user",
            "url": "http://mysystem/users/tony"
        },
        "cause": {
            "id": "myevent",
            "type": "mysystem-event"
        },
        "description": "From the order testing process",
        "extraData": {
            "Iteration": "10a",
            "Step": "4"
        },
        "generator": {
            "id": "mysystem-1",
            "type": "mysystem-application"
        },
        "type": "myplugin:type"
    },
    "transition": {
        "id": "5"
    },
    "update": {
        "comment": [
            {
                "add": {
                    "body": {
                        "content": [
                            {
                                "content": [
                                    {
                                        "text": "Bug has been fixed",
                                        "type": "text"
                                    }
                                ],
                                "type": "paragraph"
                            }
                        ],
                        "type": "doc",
                        "version": 1
                    }
                }
            }
        ]
    }
}'null