[java] java.lang.NullPointerException
     [java] 	at com.mongodb.connection.ProtocolHelper.sendCommandStartedEvent(ProtocolHelper.java:253)
     [java] 	at com.mongodb.connection.InternalStreamConnection$CommandEventSender.sendStartedEvent(InternalStreamConnection.java:684)
     [java] 	at com.mongodb.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:245)
     [java] 	at com.mongodb.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:98)
     [java] 	at com.mongodb.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:441)
     [java] 	at com.mongodb.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:76)
     [java] 	at com.mongodb.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:189)
     [java] 	at com.mongodb.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:263)
     [java] 	at com.mongodb.connection.DefaultServerConnection.command(DefaultServerConnection.java:126)
     [java] 	at com.mongodb.connection.DefaultServerConnection.command(DefaultServerConnection.java:118)
     [java] 	at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:226)
     [java] 	at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:217)
     [java] 	at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:154)
     [java] 	at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:147)
     [java] 	at com.mongodb.operation.CreateIndexesOperation$1.call(CreateIndexesOperation.java:173)
     [java] 	at com.mongodb.operation.CreateIndexesOperation$1.call(CreateIndexesOperation.java:168)
     [java] 	at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:461)
     [java] 	at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:423)
     [java] 	at com.mongodb.operation.CreateIndexesOperation.execute(CreateIndexesOperation.java:168)
     [java] 	at com.mongodb.operation.CreateIndexesOperation.execute(CreateIndexesOperation.java:69)
     [java] 	at com.mongodb.Mongo$3.execute(Mongo.java:833)
     [java] 	at com.mongodb.Mongo$3.execute(Mongo.java:814)
     [java] 	at com.mongodb.DBCollection.createIndex(DBCollection.java:1623)
     [java] 	at com.mongodb.DBCollection.createIndex(DBCollection.java:1608)
....