The SYSTEM (DB maintenance) Re-indexing job is only required for on-premise clients. Hosted environments do not need this, as we re-index databases outside of the product.
The SYSTEM (DB maintenance) batch job will show the following error because it targets workflow-related error logs that cannot be deleted.
Execution Timeout Expired.
These error messages are expected and do not require any action.
If you are on-premise and require further assistance, please raise a new case online and reference the title of this article.