Apple Explains Spotlight Re-indexing Delays After OS Updates
Apple has released a support document explaining the extended time it can take for Spotlight search to re-index after updates to iOS and macOS.

Apple has provided an explanation for the prolonged Spotlight search re-indexing process that has been observed following updates to iOS 27 and macOS 27.
The tech giant stated in a published support document that the indexing can take several hours, or even days, depending on the amount of data stored on the device. The process is said to be faster when the device is not actively in use, is connected to power, and is connected to the internet.
Apple assures users that all indexing data is stored locally on the device and is not uploaded to Apple or shared with other devices owned by the user. This issue has affected users who have updated to beta versions of iOS 27, macOS 27 Golden Gate, iPadOS 27, or visionOS 27.
The company's support document aims to clarify the re-indexing procedure for Spotlight search after these operating system updates.