Hey @bguerout, welcome to our community.
Thanks for the question and sorry for the late reply.
I'm not sure if I correctly understood your question, with "compute a ration with matching values only" do you mean to filter out ratio values above or below that value? or you want to remove from the chart every bucket that has an undefined ratio (like in the case your total is 0)?
i would like to be able to compute a ratio between a subset and a total over a period of time.
If I send to ES all http requests, i would like to be able to get the ratio of authentication requests. For example if during the last day we have 100 requests and 10 authentication requests, then the ratio should be equals to 0.10.
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