There may not be direct example but you can add pieces together. For example:
https://docs.llamaindex.ai/en/stable/examples/query_engine/CustomRetrievers/?h=hybrid+search#plugin-retriever-into-query-engineIn this example it shows you a simple hybrid search and creates a custom retriever. You can pass on this retriever in Chat Engine. Some chat engine takes retriever and some take QueryEngine. You get both in this example.
chat_engine = CondensePlusContextChatEngine.from_defaults(retriever=retriever,system_prompt = DEFAULT_SYSTEM_PROMPT,memory = LlamaIndexBot.chat_memory, node_postprocessor[FlagEmbeddingReranker(top_n=2, model=RERANKER_MODEL)] )
This will give you a chat engine with mix of hybrid search + reranking + chat engine