How to configure Graylog2 to resolve IP to DNS names?

Question

Domain Name System

Good day to all, I am aware of this , for some reason it does not work.
Several threads were created in the inputs, for syslog, for nginx and for netflow from the hardware
. According to redmi, the plugin was downloaded and thrown to everyone, the necessary lines were written in the config, everything was restarted. But as it was, it remains. Maybe someone managed to configure it. Or are there other ways to implement it?
Well, the question of practice, for those who used both that one and this is me about Graylog and Logstash, how is it better, etc.? Let's breed a holivar. Greylog is convenient as a marketplace, and the fact that the inputs are created automatically is easier. More user-friendly, the second product is not so convenient.