aws-genai-llm-chatbot
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Add Amazon Bedrock Knowledge base as a RAG Engine (retriever)
Issue #, if available: Resolves #271
Description of changes: With this PR we are adding Amazon Bedrock Knowledge Bases as additional RAG Engine (retrievers).
The KB must be already created and available in the same region used by Bedrock. The integration supports both semantic retrieval and hybrid retrieval via the KB retrieve API.
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