ModuleNotFoundError: No module named 'llama_index.graph_stores'

I am trying to use the NebulaGraphStore class from llama_index via from llama_index.graph_stores.nebula import NebulaGraphStore as suggested by the llama_index documentation, but the following error occurred:

ModuleNotFoundError                       Traceback (most recent call last)Cell In[2], line 1----> 1 from llama_index.graph_stores.nebula import NebulaGraphStoreModuleNotFoundError: No module named 'llama_index.graph_stores'

I tried updating llama_index (version 0.10.5) with pip install -U llama-index but it doesn't work. How can I resolve this?