This is the new 2.0 series of endpoints. There is no solid upgrade path from the 7.x to the 8.x as a number of things have changed. specifically:
1) there is no dependency on user_revisions anymore. This is because drupal8 added a 'changed' field which allows for similar incremental updates to take place.
2) there is no dependency on the services module anymore. this is because a) restful services are in core, b) views is in core, and c) views supports presenting their own restful services.