'How to get sum of field1 for unique values of field2 in Kibana

I have index pattern in kibana. I want to get SUM of one field based on UNIQUE values of second field. How can I get this in kibana visualization. As example :

{ server: 1, size: 813, @timestamp: "2018-12-28 09:00"}
{ server: 2, size: 654, @timestamp: "2018-12-28 09:00"}
{ server: 3, size: 752, @timestamp: "2018-12-28 09:00"}
{ server: 1, size: 915, @timestamp: "2018-12-28 10:00"}
{ server: 2, size: 823, @timestamp: "2018-12-28 10:00"}
{ server: 3, size: 783, @timestamp: "2018-12-28 10:00"}

I want solution like below :

(915 + 823 + 783 = 2521)

Any Solution ??

kibana

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'How to get sum of field1 for unique values of field2 in Kibana

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