Improve filtering options in Guide/Gather search

We would like to provide users with filters and sorting for search results in our help center. Examples of filters/sorting would be by date, alphabetically, by relevance, or by upvote count. 

Currently, users are only provided search results by relevance, which often includes very old forum posts that may not be relevant anymore. For reference, our users are primarily technicians and salespeople who require the most up-to-date information. 
 

This is a frequently occurring issue and causes frustration for our users, who have requested improved search functions. If the search logic were open to our developers, we may be able to create a diy solution, but since it is more or less a ‘black box’, we are at a loss of how to improve this without major performance issues (as we'd have to develop on the client-side). 
 

We are not currently using a workaround for this issue, though if we find one I will update this post. 
 

We would like to see both sorting and filtering options in the help center search for guide/gather, that include sorting/filtering by date, author, relevance, and votes.