Azure - Web App - Examine fails An error occurred processing the index batch

V10 latest - a live site running as an Azure Web App with all the recommended appsettings https://docs.umbraco.com/umbraco-cms/v/10.latest-lts/fundamentals/setup/server-setup/azure-web-apps Seems to have Examine issues.

There are lots of log entries for “An error occurred processing the index batch.” - Unpublishing deleting nodes fails. As far as I’m aware it was working fine and then this happened overnight.

It could be related to a deployment swap - currently just deploying from VS via a publish and swapping in the portal. How does everyone else do this - is there anything special?

I’ve checked and the file it’s trying to open doesn’t exist. So shouldn’t it try to recover / rebuild in this situation?

Only fix was to stop site then delete the /TEMP/ExamineIndexes folder and restart. Not idea for a site in production.

System.IO.FileNotFoundException: Could not find file ‘C:\home\site\wwwroot\umbraco\Data\TEMP\ExamineIndexes\ExternalIndex_e2_1.del’.
File name: ‘C:\home\site\wwwroot\umbraco\Data\TEMP\ExamineIndexes\ExternalIndex_e2_1.del’


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/113142-azure-web-app-examine-fails-an-error-occurred-processing-the-index-batch