Sum values in SingleStat


I don’t know if it’s possible but I would like to be able to sum some values in a singlestat panel.

I have measurement of disk occupation on several machines and I want to have a global occupation.

To get one disk, I use this query : {host: “xxxxx” AND disk_name:“xxxxx”}, I use the Average metric and I get the current value in the SingleStat panel.



I saw that we can sum several series (queries) by using sumSeries with a Graphite source.
Is there a way to do the same thing with an ElasticSearch source ?