I need help from you guys as I'm new to working with Elastic stack. I have installed Elastic search, Kibana and Logstash in LAN, and Filebeat in DMZ zone. All the versions are 6.2.2. I would like to output the data collected by beats to logstash. I understand that opening a port could help me achieve this, but I'm afraid of the security issues. I've seen that redis, kafka and RabbitMQ can be used, but I'm still unsure of how it works if I have queues in DMZ. Can someone advise me on how to proceed and which queue would be easy to manage for data around 15GB a day?