0.12-2018-07-21

• New-style Search Filter Backends. Old style SearchFilterBackend is
  still supported (until at least version 0.16), but is deprecated. Migrate to
  CompoundSearchFilterBackend. MultiMatchSearchFilterBackend
  introduced (the name speaks for itself).
• From now on, your views would also work with model- and object-level
  permissions of the Django REST Framework (such as DjangoModelPermissions,
  DjangoModelPermissionsOrAnonReadOnly and DjangoObjectPermissions).
  Correspondent model or object would be used for that. If you find it
  incorrect in your case, write custom permissions and declare the explicitly
  in your view-sets.
• Fixed geo-spatial geo_distance ordering for Elastic 5.x. and 6.x.
• Fixes occasionally failing tests.