What happens when a search that is kicked off by a dashboard but is then abandoned by the user? ie. they change to another dashboard etc? How does this interact with a distributed environment?
Does the splunkweb process realise that there is no web interface to send the results back to and sends the search peers a signal to stop the searches or do they continue to run until complete? If so it seems like there is plenty of potential for wasted resources.
Unless a search is explicitly sent to the background, it is killed when the UI page that dispatched it is no longer connecting to SplunkWeb and Splunkd. Backgrounded searches continue to run, as that is the point of sending a search to the background.