public void destroy() {
        throw new UnsupportedOperationException(
                "EmbulkEmbed#destroy() is no longer supported as JSR-250 lifecycle annotations are unsupported. "
                + "See https://github.com/embulk/embulk/issues/1047 for the details.");
    }
Sets an alternative {@code BulkLoader} instance mainly for testing-purpose.
embulk-core/src/main/java/org/embulk/EmbulkEmbed.java