code: public HierarchicalEntityExtractor getHierarchicalEntity(UUID appId, String versionId, UUID hEntityId) {
          return getHierarchicalEntityWithServiceResponseAsync(appId, versionId, hEntityId).toBlocking().single().body();
      }
docs: Gets information about the hierarchical entity model.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param hEntityId The hierarchical entity extractor ID.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ErrorResponseException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the HierarchicalEntityExtractor object if successful.