is there a way to select the number of retrieved nodes in an index different depending on the score? so that in a question if 5 nodes are very relevant include all them but in other question only one is relevant.
# Crear motor de chat con la colección seleccionada chat_engine = index.as_chat_engine( service_context=service_context, similarity_top_k=10, node_postprocessors=[cohere_rerank], chat_mode="context", memory=memory, )