Why do we need include_embeddings in KnowledgeGraph Index? Is there a practical scenario where it might be useful? https://docs.llamaindex.ai/en/stable/api_reference/indices/knowledge_graph/

Hey folks, this is probably a very simple question so apologies in advance for any stupid mistakes.

I am trying to get the summary of a document after a node has been retrieved (through an index). I want to use this summary document into the query engine. This is because the node itself doesn't have relevant information for my question. What's the best workflow for this?