@Deprecated  // https://github.com/embulk/embulk/issues/1304
    @SuppressWarnings("deprecation")  // https://github.com/embulk/embulk/issues/1304
    public org.embulk.config.ModelManager getModelManager() {
        return this.modelManager;
    }
Sets an alternative {@code BulkLoader} instance mainly for testing-purpose.
embulk-core/src/main/java/org/embulk/EmbulkEmbed.java