I have a set of .pdf/.docx documents with content. I need to search for the most suitable document according to a particular sentence. For instance:
Sentence: "Security in the work environment"
The system should return the most appropriate document which contains at least the content expressed in the sentence. It should be a sort of search bar with advanced capabilities; I have a constraint: I can not have an apriori classification since the number of documents and the related category could vary on time.
How should I address this kind of task?