Dear Michael Teets
Thank you for reaching out to the Microsoft community.
I'm sorry to hear that you're encountering an issue with Content Search, where you are getting an error "Internal server error occurred. Please try again later. (CS019-001)".
While our primary focus is on basic Outlook support, I’d like to offer some guidance regarding your query.
These errors (with error codes of CS001-002, CS003-002, CS008-009, CS012-002, and other errors of the form CS0XX-0XX) indicate that Content Search failed to search specific content locations
Restarting the search will often result in similar errors on different servers. Instead of restarting the search, select Retry at the top of the search results page.

For more information kindly check: Retry a Content Search to resolve a content location error | Microsoft Learn
For issues specifically related to Content Search, I recommend posting your concerns in the relevant community. You can find specialized assistance in the "Microsoft Purview" section at Microsoft Purview - Microsoft Q&A; Experts in this category have extensive knowledge of the Microsoft Purview and can provide tailored solutions to unique problems.
I apologize for redirecting you to a different community, but I believe this step will ensure faster and more accurate assistance for your specific scenario.
Thank you for your cooperation and understanding. Please do not hesitate to post your queries in Microsoft Community and we will always do our best to assist you!
Have a great day!