Search by category

[scisci]

You link to this article in your docs: https://tech.ebayinc.com/research/making-e-commerce-search-faster/ . I know most of that was about optimization, but as a complete newcomer to this space, I wonder if you have an example of how this category type searching can be done using Trinity? i.e. if I want to mark a document as belonging to a specific category and then search only within that category, is it possible?