Index csv and txt file contents

[felipeelia]

Description of the Change

Closes #3874

How to test the Change

Changelog Entry

Changed - Index CSV and TXT file contents

Credits

Props @felipeelia

Checklist:

• [ ] I agree to follow this project's Code of Conduct.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [ ] All new and existing tests pass.