Short answer
No, you cannot duplicate an Index in AskTuring at this time.
Full explanation
AskTuring does not currently offer a feature to copy or duplicate an Index. If you need a similar Index with the same documents, you will need to create a new Index and re-upload the files manually.
This ensures that each Index is intentionally built and clearly documented from the start. The ability to duplicate an Index may be considered for future versions based on demand.