public static ExecutionFactory empty() {
        return new ExecutionFactory(new ChainsConfig.Builder().build(),
                                    new IndexInfoConfig.Builder().build(),
                                    SchemaInfo.empty(),
                                    new QrSearchersConfig.Builder().build(),
                                    new ComponentRegistry<>(),
                                    new SpecialtokensConfig.Builder().build(),
                                    new SimpleLinguistics(),
                                    new ComponentRegistry<>(),
                                    null);
    }
Returns the renderers known to this
container-search/src/main/java/com/yahoo/search/searchchain/ExecutionFactory.java