Depends a lot on the search and filtering options user has and needs to remember. The more is the thing for professionals and the less it is close to their main task (saving lives for example), the less of their daily brain capacity the UI should take. Very generally:
A lot of filters, possible keywords in search, user does not use the terminology on daily basis. -
Display items for user to have a clue where to start. They'll be able to guess or recall taxonomy and keywords from it.
In case you have content that share many of these parameters - the content you are searching in being homogenous (of one kind), user uses the thing very often, small number of keywords and filters -
You can try to display just prompt to search or apply filters, but really take your time with this way, test it and play with wording, visual and layout. Plus it's more prone to usability issues in time when adding little features and tweaks here and there.