Sorry for not knowing a lot since I am very new...
I have been playing around with using the sub aggregations in Kibana's visualization tab. One aspect of it I don't understand is the filter metric. You can specify a new sub bucket to be of type filter and then it creates a new text field below it called "filter 1." I have figured out that you can type words in it and then Kibana will filter the elastic search data with those words. However, what I am curious about is how to limit the scope of the filter. Can I make it only look at certain fields? Can I pass it filters like I can on the console? Is there a better way to filter data based off one field that shares values with other fields in the same "data point"?
I have been reading a lot about how to use filters from the console, I'm just curious how to use that textfield in the visualization editor.