How to implement logging of multiple servers through ELK?

Question

logstash

Good afternoon! As an inexperienced system administrator, I had a question about how to set up logging on servers, and everything was displayed on kibana. On one server, I installed this function without problems through bits, which sends logs to logstash. But when installed on another bits server, Logstash does not display logs in the kibana of this server.

Answer 1

and what prevents redirecting logs to logstash by the syslog itself?