A migration will simply report "Data transfer error" when we have rich error details on the destination shard that are logged but not returned to the user

moveChunk res: {

	"ok" : 0,

	"errmsg" : "Data transfer error",

	"code" : 96,

	"codeName" : "OperationFailed",

	"$clusterTime" : {

		"clusterTime" : Timestamp(1510773890, 3),

		"signature" : {

			"hash" : BinData(0,"KrDR/Iuwg3eUkgFxgvH9NTilYmk="),

			"keyId" : NumberLong("6488724371891290116")

		}

}