One dashboard which combines system Metricbeats from many host

Elastic Stack Kibana
1

I try out Elastic Stack the following way:
Kibana + Elasticsearch + System Beat 6 Windows hosts.
I use 2 sample dashboard to view: [Metricbeat System] Overview + [Metricbeat System] Host overview

TASK
I need do a Dashboard which combines system Metricbeats from 6 host into ONE view (CPU Usage Gauge visualization 6 times etc).

QUESTIONS
HOWTO achieve in general?
Should i start using Logstash?

Any guidance for HOWTO achieve would be very much appriciated.

TASK later
Use X-Pack for cluster support, more beats, watcher alerts etc.

2

Are all the metrics going into the same index? The dashboard should already represent all the hosts - you would need to add a filter to drill down to a single host.

3

Yes same index. I simply installed system beats equally on 6 windows box and use sample dashboards - all works out-of-the-box... very easy to initialize. So i would like thos CPU visualizations to be present 6 times, but did not solve HOWTO cusomize them with data feed. Can i do so when index in the same?