private void checkId(String configId) {
        if ( ! id2producer.containsKey(configId)) {
            log.log(Level.FINE, () -> "Invalid config id: " + configId);
        }
    }
Throw if the config id does not exist in the model.

@param configId a config id
config-model/src/main/java/com/yahoo/vespa/model/VespaModel.java