I have several nodes and each has several filesystems,
I would like to create a visualization for each file system in each node currently I fail to see all because I split the group using Terms aggregation on node.keyword thus I see all nodes but only the unique file systems.
As far as I can tell sub buckets for gauges aren't supported, so you'll have to hack it a bit. I'm not sure if there's technical reasons for it but I think its a reasonable enhancement request if you want to file at https://github.com/elastic/kibana/issues/new.
I'd try making a scripted field that concatenates node and filesystem and then bucketing off that field.
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