code: public Observable<CompositeEntityExtractor> getCompositeEntityAsync(UUID appId, String versionId, UUID cEntityId) {
          return getCompositeEntityWithServiceResponseAsync(appId, versionId, cEntityId).map(new Func1<ServiceResponse<CompositeEntityExtractor>, CompositeEntityExtractor>() {
              @Override
              public CompositeEntityExtractor call(ServiceResponse<CompositeEntityExtractor> response) {
                  return response.body();
              }
          });
      }
docs: Gets information about the composite entity model.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param cEntityId The composite entity extractor ID.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the CompositeEntityExtractor object