docs: public Observable<OperationStatus> deleteRegexEntityRoleAsync(UUID appId, String versionId, UUID entityId, UUID roleId) {
          return deleteRegexEntityRoleWithServiceResponseAsync(appId, versionId, entityId, roleId).map(new Func1<ServiceResponse<OperationStatus>, OperationStatus>() {
              @Override
              public OperationStatus call(ServiceResponse<OperationStatus> response) {
                  return response.body();
              }
          });
      }