Hybrid Search is now generally available in Knowledge Bases for Bedrock for OpenSearch Serverless. Retrieval augmented generation (RAG) applications typically use semantic search, which relies on semantic vectors to search unstructured text. These vectors are created from machine learning models to capture contextual and linguistic meaning within the data to answer human-like questions. Hybrid search combines this semantic search with a text based search to improve the relevance of retrieved results, especially for keyword searches.
Source:: Amazon AWS