replset:PRIMARY> db.test.insertOne({_id:1})
{ "acknowledged" : true, "insertedId" : 1 }
replset:PRIMARY> db.test.insertOne({_id:1},{writeConcern:{w:"majority",wtimeout:5000}})
...
WAIT
...
2017-04-26T18:09:57.685-0400 E QUERY    [thread1] WriteError: E11000 duplicate key error collection: test.test index: _id_ dup key: { : 1.0 } :
WriteError({
	"index" : 0,
	"code" : 11000,
	"errmsg" : "E11000 duplicate key error collection: test.test index: _id_ dup key: { : 1.0 }",
	"op" : {
		"_id" : 1
	}
})
WriteError@src/mongo/shell/bulk_api.js:469:48
Bulk/mergeBatchResults@src/mongo/shell/bulk_api.js:836:49
Bulk/executeBatch@src/mongo/shell/bulk_api.js:906:13
Bulk/this.execute@src/mongo/shell/bulk_api.js:1150:21
DBCollection.prototype.insertOne@src/mongo/shell/crud_api.js:242:9
@(shell):1:1
replset:PRIMARY> rs.status()
{
	"set" : "replset",
	"date" : ISODate("2017-04-26T22:10:05.449Z"),
	"myState" : 1,
	"term" : NumberLong(3),
	"heartbeatIntervalMillis" : NumberLong(2000),
	"optimes" : {
		"lastCommittedOpTime" : {
			"ts" : Timestamp(1493242117, 1),
			"t" : NumberLong(1)
		},
		"appliedOpTime" : {
			"ts" : Timestamp(1493244598, 1),
			"t" : NumberLong(3)
		},
		"durableOpTime" : {
			"ts" : Timestamp(1493244598, 1),
			"t" : NumberLong(3)
		}
	},
	"members" : [
		{
			"_id" : 0,
			"name" : "AD-MAC10G.local:27017",
			"health" : 0,
			"state" : 8,
			"stateStr" : "(not reachable/healthy)",
			"uptime" : 0,
			"optime" : {
				"ts" : Timestamp(0, 0),
				"t" : NumberLong(-1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(0, 0),
				"t" : NumberLong(-1)
			},
			"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
			"optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"),
			"lastHeartbeat" : ISODate("2017-04-26T22:10:04.105Z"),
			"lastHeartbeatRecv" : ISODate("2017-04-26T21:28:42.092Z"),
			"pingMs" : NumberLong(0),
			"lastHeartbeatMessage" : "Connection refused",
			"configVersion" : -1
		},
		{
			"_id" : 1,
			"name" : "AD-MAC10G.local:27018",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 2740,
			"optime" : {
				"ts" : Timestamp(1493244598, 1),
				"t" : NumberLong(3)
			},
			"optimeDate" : ISODate("2017-04-26T22:09:58Z"),
			"infoMessage" : "could not find member to sync from",
			"electionTime" : Timestamp(1493244557, 1),
			"electionDate" : ISODate("2017-04-26T22:09:17Z"),
			"configVersion" : 1,
			"self" : true
		},
		{
			"_id" : 2,
			"name" : "AD-MAC10G.local:27019",
			"health" : 1,
			"state" : 7,
			"stateStr" : "ARBITER",
			"uptime" : 57,
			"lastHeartbeat" : ISODate("2017-04-26T22:10:03.982Z"),
			"lastHeartbeatRecv" : ISODate("2017-04-26T22:10:02.801Z"),
			"pingMs" : NumberLong(0),
			"configVersion" : 1
		}
	],
	"ok" : 1
}
replset:PRIMARY>