How would you answer an interview scenario involving Hybrid search?

For an interview scenario involving Hybrid search, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Hybrid search combines lexical retrieval such as BM25 with vector semantic retrieval. In this scenario, for a technical support assistant that must find both error codes and conceptual matches, explain how hybrid search would improve retrieval. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.