code: public ServiceFuture<UUID> addHierarchicalEntityChildAsync(UUID appId, String versionId, UUID hEntityId, AddHierarchicalEntityChildOptionalParameter addHierarchicalEntityChildOptionalParameter, final ServiceCallback<UUID> serviceCallback) {
          return ServiceFuture.fromResponse(addHierarchicalEntityChildWithServiceResponseAsync(appId, versionId, hEntityId, addHierarchicalEntityChildOptionalParameter), serviceCallback);
      }
docs: Creates a single child in an existing hierarchical entity model.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param hEntityId The hierarchical entity extractor ID.
  @param addHierarchicalEntityChildOptionalParameter the object representing the optional parameters to be set before calling this API
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object