I keep getting error for this :

bm25_retriever = BM25Retriever.from_defaults(nodes=text_nodes, similarity_top_k=2)

error:
~llama_index/retrievers/bm25/base.py", line 119, in from_defaults
raise ValueError("Please pass exactly one of index, nodes, or docstore.")
ValueError: Please pass exactly one of index, nodes, or docstore.

Even tho I am passing the textnodes

I want to built bm25 retriever and store it in postgress database. is that possible ?