Trying to get started with filebeat and metricbeat I've noticed that filebeat defines @timestamp as type/format date/date while metricbeat does so as string/date (as shown in the kibana index patterns).
Consequently, using Kibana "Discover" doesn't show any data for metricbeat index but for filebeat index. Both indexes are populated and the beats running and connected.
What/ is there something wrong with the metricbeat index definition in v6.1.1?
PS.: I've not been able though to find out where
@timestamp is actually defined per beat type, any hint is appreciated.