Add filter options to search/ endpoint

This will allow search results to be a lot more condensed and provide more functionality to users wishing to increase the flexibility of their queries

Start by locating the search/ endpoint in the Spring Boot API and reviewing how its current query is handled. Clarify which filter options and condensed result shape are required before implementation; completion should include the agreed endpoint behavior and tests, but the issue does not specify the exact filters or test location.

Written by the indexing model from the issue text.