MongoDB Enterprise mongos> db.test.createIndex({foo: 1}, {},  51);

{

	"ok" : 0,

	"errmsg" : "commitQuorum has to be a non-negative number and not greater than 50",

	"code" : 9,

	"codeName" : "FailedToParse",

	"$clusterTime" : {

		"clusterTime" : Timestamp(1618595665, 2),

		"signature" : {

			"hash" : BinData(0,"DoXuzbbc3DFYux4CmBjsxioEjAM="),

			"keyId" : NumberLong("6950651909917114371")

		}

	},

	"operationTime" : Timestamp(1618595664, 7)

}