Get traffic to your iOS 9 app from Google Search results. Google app indexing will start serving iOS 9 universal links from mid october 2015.
There are two steps to to enable app indexing in your iOS 9 app and get listed in Google search results:
Google is also deprecating iOS 7 and iOS 8 integrations which were in beta for select partners and were using an alternate link ios-app:// format
Reference: Support HTTP Deep Links – Google Developers