Difficulty trying to find a way to use facets

Elastic Stack Elasticsearch
1

Hi all,

First of all, I posted via email but somehow I can't see it in
groups.google.com so posting via web-ui.

I'm using ES to store maillogs. In that, I'm trying to use ES to generate
statistics for ex, per domain bandwidth usage etc.

For ex, if I have a document which has fields like:

Now, there can be many email addresses like abc@domain.com. I just want the
summation of size for a particular domain. How do I accomplish that?

I had a look at statistical facet and scripts but I'm not sure how will I
use it to do per domain summation of @fields.size field. Ultimately, I want
something like: domain.com did x size of mails.

Any help is highly appreciated. Thanks

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