Hi, I'm in same case.
I have Filebeat with system module and Auditbeat with all default module (except process and socket) and my hosts table in SIEM is empty (also Authentication).
In auditbeat error log I have this error : "error encoding host information: gob: type host.Host has no exported fields "
In JSON document host.name is defined.
Autidbeat and Filebeat send document to logstash
Elasticsearch 7.2
Filebeat 7.2
Auditbeat 7.2
Logstash 7.2
