Error configuring mongodb replicaset with inmemory

I'm trying to configure a MongoDB replicaset with 3 replicas. The primary and another use the in memory storage engine, and the third uses wired tiger. I am using this configuration. When I restart the cluster the data does not persist. Server has startup warnings: ** WARNING: This replica set node is running without journaling enabled but the ** writeConcernMajorityJournalDefault option to the replica set config ** is set to true. The writeConcernMajorityJournalDefault ** option to the replica set config must be set to false ** or w:majority write concerns will never complete. ** In addition, this node's memory consumption may increase until all ** available free RAM is exhausted. ** WARNING: This replica set node is using in-memory (ephemeral) storage with the ** writeConcernMajorityJournalDefault option to the replica set config ** set to true. The writeConcernMajorityJournalDefault option to the ** replica set config must be set to false ** or w:majority write concerns will never complete. ** In addition, this node's memory consumption may increase until all ** available free RAM is exhausted. And my configuration. rs0:PRIMARY> cfg = rs.conf() { "_id" : "rs0", "version" : 102744, "protocolVersion" : NumberLong(1), "writeConcernMajorityJournalDefault" : false, "members" : [ { "_id" : 0, "host" : "mongodb-mongodb-replicaset-0.mongodb-mongodb-replicaset.default.svc.cluster.local:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : { }, "slaveDelay" : NumberLong(0), "votes" : 1 }, { "_id" : 1, "host" : "mongodb-mongodb-replicaset-1.mongodb-mongodb-replicaset.default.svc.cluster.local:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : { }, "slaveDelay" : NumberLong(0), "votes" : 1 }, { "_id" : 2, "host" : "mongodb-mongodb-replicaset-2.mongodb-mongodb-replicaset.default.svc.cluster.local:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : true, "priority" : 0, "tags" : { }, "slaveDelay" : NumberLong(0), "votes" : 1 } ], "settings" : { "chainingAllowed" : true, "heartbeatIntervalMillis" : 2000, "heartbeatTimeoutSecs" : 10, "electionTimeoutMillis" : 10000, "catchUpTimeoutMillis" : -1, "catchUpTakeoverDelayMillis" : 30000, "getLastErrorModes" : { }, "getLastErrorDefaults" : { "w" : 1, "wtimeout" : 0 }, "replicaSetId" : ObjectId("5e736baa5c51ff3e198dd880") } } The writeConcernMajorityJournalDefault option IS set to false! Thanks in advance!