How can I do scripted aggregation in Kibana + Elasticsearch?

Question

Let\'s say I have a log of events of ad displays and ad clicks stored via Logstash in Elasticsearch and displayed in Kibana 4. I would like to calculate a simple metric like

Answer 1

Kibana 4 includes support for Elasticsearch scripting. You can go to Settings > Indices (pick your pattern) > Scripted Fields and add a new scripted field that computes your CTR. Take a look at "Scripted Fields" at elastic blog for more info.