code: public UUID addCompositeEntity(UUID appId, String versionId, CompositeEntityModel compositeModelCreateObject) {
          return addCompositeEntityWithServiceResponseAsync(appId, versionId, compositeModelCreateObject).toBlocking().single().body();
      }
docs: Adds a composite entity extractor to the application.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param compositeModelCreateObject 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.