Logstash Hang

I have RHEL Server 6.6 Santiago - Java 1.8.0_25 / 64-Bit Server (build 25.25-b02) - Logstash 7.4.2

Logstash is running. Logs appear in Kibana.

However, the logs do not appear after 20 to 25 minutes. When I check the service status on the server, it appears to be running. But he doesn't do anything. When I look at the Logstash logs, it doesn't write anything.

Is there anyone have an idea?