This is the Alpha 12 release of the Search API module's Drupal 8 version.
While there are no known major bugs and the module is fully usable at this point, this version is still unstable and should only be used with great care in a production environment. No data update paths will be provided for Alpha versions of this module, so upgrading to this version, or from this to a later one, might discard some of your search configuration. Use with care!
This version finally adds support for individual fields inside Views as well as some much-needed internal improvements that will make the module more stable going forward.