Due to some resource limitations I have to set maximum number of Filebeat harvesters. But after that change there are no more logs forwarded to Logstash.
Here are some logs from Filebeat
2017/11/22 11:13:56.421773 prospector_log.go:248: ERR Harvester could not be started on new file: /var/audit/service.audit, Err: Harvester limit reached.
2017/11/22 11:14:00.863862 metrics.go:39: INFO Non-zero metrics in the last 30s: filebeat.harvester.skipped=1332