Duda Nogueira from Weaviate here!

Can you confirm you are using Langchain and not Llamaindex?

For Langchain, you need to explicitly request this with;

docs = db.similarity_search("traditional food", return_uuids=True)
print(docs[0].metadata.get("uuid"))

I just noticed this is an undocumented feature! I have added it here in our langchain recipes to make it visible:

https://github.com/weaviate/recipes/tree/main/integrations/llm-frameworks/langchain/loading-data

Let me know if this helps!

Thanks!