I have an issue that is not unlike this request...
Apply a simple math operation to doc_count
We have events rolling in, we look at them and check for certain features. We mark them with a sort of classification scheme. Say "Apples" and "Bananas".
I can "aggs" on that scheme and get a doc_count for Apples and Bananas.
Is there a way to get the Apple to Banana ratio?
I see this is open: doc_count metric agg
I had the thought of logstash -> mutate -> add_field something like { "__count_me": 1 } so I could do math over that. Is there another way out?
Has anyone skinned this cat in a clever way? 
Thanks!
-ave