How can store graph index

[ragesh2000]

Iam referring to https://github.com/run-llama/llama_index/blob/main/docs/docs/examples/cookbooks/GraphRAG_v1.ipynb for creating GraphRAG using llamaindex. So once an index is created how can we store it ? I have tried the conventional .persist method but got an error.

index = PropertyGraphIndex(
    nodes=nodes,
    property_graph_store=GraphRAGStore(),
    kg_extractors=[kg_extractor],
    show_progress=True,
)
index.property_graph_store.build_communities()
index.storage_context.persist(persist_dir="./graphstore2")
storage_context = StorageContext.from_defaults(persist_dir="./graphstore2")
loaded_index = load_index_from_storage(storage_context)

query_engine = GraphRAGQueryEngine(
    graph_store=loaded_index.property_graph_store, llm=llm
)
response = query_engine.query(
    "What are the main news discussed in the document?"
)

Error
instance of GraphRAGStore expected (type=type_error.arbitrary_type; expected_arbitrary_type=GraphRAGStore)

How can I store the index and load later?

[KYLEEZTSMC]

I dig into llama_index source code and found out this:
`
storage_context = StorageContext.from_defaults(persist_dir="./storage", property_graph_store=GraphRAGStore())

test_index = load_index_from_storage(storage_context)

test_query_engine = GraphRAGQueryEngine(
graph_store=test_index.property_graph_store,
llm=llm,
index=test_index,
)
`
property_graph_store parameter can be used to solve your problem.