code: public ServiceFuture<UUID> addCompositeEntityChildAsync(UUID appId, String versionId, UUID cEntityId, AddCompositeEntityChildOptionalParameter addCompositeEntityChildOptionalParameter, final ServiceCallback<UUID> serviceCallback) {
          return ServiceFuture.fromResponse(addCompositeEntityChildWithServiceResponseAsync(appId, versionId, cEntityId, addCompositeEntityChildOptionalParameter), serviceCallback);
      }
docs: Creates a single child in an existing composite entity model.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param cEntityId The composite entity extractor ID.
  @param addCompositeEntityChildOptionalParameter 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