Description

In this PR:

• an optional callbacks parameter is added to the index API for cleaner integration with the solution accelerator and other users.
• removed a hardcoded folder path name that was causing an empty directory to get created
• add a notebook that provides a demonstration of the Index + Query API

Checklist

• I have tested these changes locally.
• I have reviewed the code changes.
• I have updated the documentation (if necessary).
• I have added appropriate unit tests (if applicable).