Spotlight Suggestions shows you suggestions from the web, your contacts, apps, nearby locations, and media, including iTunes and the App Store—and even offers suggestions before you start typing.
If you do not want your Spotlight search queries and Spotlight Suggestions usage data sent to Apple, you can turn off Spotlight Suggestions. To do so, open Settings, tap General, tap Spotlight Search and deselect both Spotlight Suggestions and Bing Web Results. If you turn off Spotlight Suggestions and Bing Web Results, Spotlight will only search the contents of your device.