is llama_index.query_engine and llama_

No they are the core part of LlamaIndex. However the import pattern do have changed!

All these came with recent v0.10.x update:
Migration Guide https://pretty-sodium-5e0.notion.site/v0-10-0-Migration-Guide-6ede431dcb8841b09ea171e7f133bd77

Package registry https://pretty-sodium-5e0.notion.site/ce81b247649a44e4b6b35dfb24af28a6?v=53b3c2ced7bb4c9996b81b83c9f01139

thanks for the info!