{
    "ts": Timestamp(1538534640, 11),
    "t": NumberLong(1),
    "op": "c",
    "ns": "admin.$cmd",

    // The new commitTransaction command, for prepared transaction.
    "o": { "commitTransaction": 1, "prepared": true },

    "lsid": < lsid > ,
    "txnNumber": NumberLong("1"),

    // Pointing to the previous oplog entry in the transaction.
    "prevOpTime": { "ts": Timestamp(1538534640, 10), "t": NumberLong(1) }
}