Hello, I have a basic question because I

Hello, I have a basic question because I am not understanding something. I'm trying to use chromadb with docker:

import chromadb remote_db = chromadb.HttpClient() chroma_collection = remote_db.get_or_create_collection("quickstart") vector_store = ChromaVectorStore(chroma_collection=chroma_collection) storage_context = StorageContext.from_defaults(vector_store=vector_store) service_context = ServiceContext.from_defaults(embed_model=embed_model) index = VectorStoreIndex.from_documents( documents, storage_context=storage_context, service_context=service_context )
This is the code I want to make it work. I am creating a chromadb collection in one backend where the documents are allocated.
From other backend I want to create this index and make querys.
My question is, why I need to use documents in the last line of the code??
Chromadb doesn't save this data with the related vector???