code: public UUID addHierarchicalEntity(UUID appId, String versionId, HierarchicalEntityModel hierarchicalModelCreateObject) {
          return addHierarchicalEntityWithServiceResponseAsync(appId, versionId, hierarchicalModelCreateObject).toBlocking().single().body();
      }
docs: Adds a hierarchical entity extractor to the application version.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param hierarchicalModelCreateObject A model containing the name and children of the new entity extractor.
  @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 UUID object if successful.