GoKawiiliOS 27 update triggers lengthy Search and Siri reindexing on iPhones
Apple's iOS 27 update rebuilds the Search system it first previewed at WWDC in June, prompting an 'Optimizing Search and Siri' banner in Settings after installation. This reindexing process scans and reorganizes metadata across the device so Spotlight and Siri can return faster, more accurate results, and it can take anywhere from a few hours to several days to complete.