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A Generative AI Engineer is configuring a RAG-based chatbot to help employees understand internal security policies. The application uses: A Vector Search index populated with policy documents A foundation model accessed via Databricks Model Serving A retriever and response generator implemented using LangChain After deployment, users report that the chatbot responds with outdated policy information. Investigation reveals that newly updated documents are not reflected in the answers, even though they exist in the document source. What is the MOST effective step the engineer should take to fix this issue?