Exception Service Unavailable: Documents

There are several causes for this error, most of which are related to the user creating too many docs in one setting.

[From Google](https://developers.google.com/apps-script/guides/support/troubleshooting#common_errors):
There are a couple possible causes for these errors:

- A Google server or system is temporarily unavailable. Wait for a few moments and try running the script again.
- There is an error in your script that doesn't have a corresponding error message. Try debugging your script and see if you can isolate the problem.
- There is a bug in Google Apps Script that is causing this error. For instructions on searching for and filing bug reports, see the Bugs. Before filing a new bug, search to see if others have already reported it.

Start by reproducing the exception in the Google Docs add-on, especially after creating many documents in one setting, and review the linked Google Apps Script troubleshooting guidance. The issue does not name a source file, test, or specific change, so the cause and definition of done still need to be established.

Written by the indexing model from the issue text.