LangChain4j RAG Implementation Patterns Overview Implements RAG systems with LangChain4j: document ingestion pipelines, embedding stores, and vector search for chat-with-documents and knowledge-enhanced AI applications. When to Use This Skill - Building chat-with-documents systems or document Q&A over PDFs, text files, or web pages - Creating AI assistants with access to company knowledge bases or external sources - Implementing semantic search or hybrid search over document repositories - Building domain-specific AI with curated knowledge and source attribution Instructions Initialize RAG Pr…