Starting November 1, 2024, on-demand indexes for SharePoint and OneDrive Search using Application Permissions will be decommissioned if not queried in 100 days. This change does not affect normal user or delegated permissioned Search traffic. Organizations should plan for potential index rebuild time for infrequent application searches.
Applies to: SharePoint Online · OneDrive for Business
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).