docs: public Observable<UUID> addHierarchicalEntityChildAsync(UUID appId, String versionId, UUID hEntityId, AddHierarchicalEntityChildOptionalParameter addHierarchicalEntityChildOptionalParameter) {
          return addHierarchicalEntityChildWithServiceResponseAsync(appId, versionId, hEntityId, addHierarchicalEntityChildOptionalParameter).map(new Func1<ServiceResponse<UUID>, UUID>() {
              @Override
              public UUID call(ServiceResponse<UUID> response) {
                  return response.body();
              }
          });
      }