Excluding an individual item from search results

Hello! I have a multiple-item region with upcoming classes. The client has a year-round arts school and the classes are often repeated each summer or each November, for example .... so I've got a checkbox to hide those particular items (classes) from the site if they are not currently running. However, the hidden items still show up in search results.

I've seen a handful of people asking in the forums here for the ability to hide individual items from search results, and I just wondered whether that has been implemented or if it will be soon. If it has been implemented already, how do I make that happen? :)

Thank you!