Unfortunately Kibana 4 is missing a lot of functionality from 3.x. One feature that we really want back is the global search scope per dashboard.

Example: Say you've got a dashboard showing hits on a web service. You've got a pie chart showing HTTP return codes, a bar chart showing response times, and another few graphs and charts detailing various data out of the requests themselves.

You could click on, say, the "500" in your return code pie chart, and then every visualization on the page would redraw and show you stats for just requests that that were 500s. (What's unique about the requests that return server errors?)

Or turn it around - click on the section of a chart that denotes requests that took longer than 100ms to process, and now you see info about those requests only. (What makes these long-time requests so special?)

This was a jaw-droppingly awesome troubleshooting tool, and now it's gone. I hope they return it before Kibana4 gets out of beta!