Filebeat – No Harvesters Starting

Using filebeat-7.17.4, we have seen instances where no harvesters will start and no IP communication is established with the logstash servers. Stopping the filebeat service, confirming the process and any associated network ports are closed, and then starting the service does not restore communication. In this situation, we have had to restart the ​logstash​ servers and immediately begin to see harvesters spin up in the log files:

2022-09-15T12:02:20.018-0400    INFO    [input.harvester]       log/harvester.go:309    Harvester started for paths: 
[/var/log/network/network.log /opt/splunk/var/log/syslog-ng/*/*.log]       
{"input_id": "bf04e307-7fb3-5555-87d5-55555d3fa8d6", "source": "/var/log/syslog-ng/",
 "state_id": "native::2228458-65570", "finished": false, "os_id": "2225548-64550", "old_source": 
"/var/log/syslog-ng/", "old_finished": true, "old_os_id": "2225548-64550", 
"harvester_id": "36555c83-455c-4551-9f55-dd5555552771"}

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