On a 1-node replica set: > db.createCollection( "c" ) > db.getCollectionInfos() [ { "name" : "c" , "type" : "collection" , "options" : { }, "info" : { "readOnly" : false , "uuid" : UUID( "44dd4cdb-4889-43e1-bd2c-f7375d92c8f8" ) }, "idIndex" : { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_" , "ns" : "test.c" } } ] > db.runCommand({applyOps: [{op: "c" , ns: "test.c" , ui: UUID( "44dd4cdb-4889-43e1-bd2c-f7375d92c8f8" ), o: {createIndexes: "c" , v: 2, key: {a: 1}, name: "a_1" }}]}) > db.c.getIndexes() [ { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_" , "ns" : "test.c" }, { "v" : 2, "key" : { "a" : 1 }, "name" : "a_1" , "ns" : "test.c" } ] > use local > db.oplog.rs.find().pretty() { "ts" : Timestamp(1507299002, 1), "h" : NumberLong( "4324269916467276683" ), "v" : 2, "op" : "n" , "ns" : "", "o" : { "msg" : "initiating set" } } { "ts" : Timestamp(1507299004, 1), "t" : NumberLong(1), "h" : NumberLong( "8480815567193554397" ), "v" : 2, "op" : "n" , "ns" : "", "wall" : ISODate( "2017-10-06T14:10:04.886Z" ), "o" : { "msg" : " new primary" } } { "ts" : Timestamp(1507299004, 2), "t" : NumberLong(1), "h" : NumberLong( "1378629489624595755" ), "v" : 2, "op" : "c" , "ns" : "config.$cmd" , "ui" : UUID( "87ad6081-0db2-46cb-9d00-149ecb46d6d1" ), "wall" : ISODate( "2017-10-06T14:10:04.952Z" ), "o" : { "create" : "transactions" , "idIndex" : { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_" , "ns" : "config.transactions" } } } { "ts" : Timestamp(1507299029, 1), "t" : NumberLong(1), "h" : NumberLong( "-7494492021434764735" ), "v" : 2, "op" : "c" , "ns" : "admin.$cmd" , "ui" : UUID( "c46411b5-27fa-4a07-869f-0ab592b27245" ), "wall" : ISODate( "2017-10-06T14:10:29.769Z" ), "o" : { "create" : "system.keys" , "idIndex" : { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_" , "ns" : "admin.system.keys" } } } { "ts" : Timestamp(1507299029, 2), "t" : NumberLong(1), "h" : NumberLong( "-3000009358249085337" ), "v" : 2, "op" : "i" , "ns" : "admin.system.keys" , "ui" : UUID( "c46411b5-27fa-4a07-869f-0ab592b27245" ), "wall" : ISODate( "2017-10-06T14:10:29.769Z" ), "o" : { "_id" : NumberLong( "6473799927473373186" ), "purpose" : "HMAC" , "key" : BinData(0, "ysjEJXM2UXNCJ9GepIlvYuvq+KM=" ), "expiresAt" : Timestamp(1515075004, 0) } } { "ts" : Timestamp(1507299029, 3), "t" : NumberLong(1), "h" : NumberLong( "4654173349023495145" ), "v" : 2, "op" : "i" , "ns" : "admin.system.keys" , "ui" : UUID( "c46411b5-27fa-4a07-869f-0ab592b27245" ), "wall" : ISODate( "2017-10-06T14:10:29.783Z" ), "o" : { "_id" : NumberLong( "6473799927473373187" ), "purpose" : "HMAC" , "key" : BinData(0, "GVzdBk6CjLMjVMo9aZId1oBxOb4=" ), "expiresAt" : Timestamp(1522851004, 0) } } { "ts" : Timestamp(1507299095, 1), "t" : NumberLong(1), "h" : NumberLong( "2281830126279321321" ), "v" : 2, "op" : "c" , "ns" : "test.$cmd" , "ui" : UUID( "44dd4cdb-4889-43e1-bd2c-f7375d92c8f8" ), "wall" : ISODate( "2017-10-06T14:11:35.888Z" ), "o" : { "create" : "c" , "idIndex" : { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_" , "ns" : "test.c" } } }