Error occurred: Timed out after 30000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=primary}. Client view of cluster state is {type=REPLICA_SET, servers=[{address=noobmeter_mongo3:27017, type=REPLICA_SET_ARBITER, roundTripTime=0.4 ms, state=CONNECTED}, {address=noobmeter_mongo2:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketException: noobmeter_mongo2}, caused by {java.net.UnknownHostException: noobmeter_mongo2}}]