docs: public Observable<RoleAssignmentInner> getByIdAsync(String roleAssignmentId) {
          return getByIdWithServiceResponseAsync(roleAssignmentId).map(new Func1<ServiceResponse<RoleAssignmentInner>, RoleAssignmentInner>() {
              @Override
              public RoleAssignmentInner call(ServiceResponse<RoleAssignmentInner> response) {
                  return response.body();
              }
          });
      }