What is the StatelessSession in Hibernate 7 and when should you use it?

try (StatelessSession ss = sf.openStatelessSession()) {
    ss.beginTransaction();

    // Hibernate 7: must set batch size explicitly on StatelessSession!
    ss.setJdbcBatchSize(50);  // hibernate.jdbc.batch_size has NO effect here

    // New batch operations in Hibernate 7:
    ss.insertMultiple(products);   // batch inserts
    ss.updateMultiple(toUpdate);   // batch updates

    // Bypass L2 cache for bulk operations (new default is to use it):
    ss.setCacheMode(CacheMode.IGNORE);

    // Scrollable results for very large datasets:
    ScrollableResults<Product> scroll = ss
        .createQuery("FROM Product", Product.class)
        .scroll(ScrollMode.FORWARD_ONLY);
    while (scroll.next()) {
        Product p = scroll.get();
        p.setPrice(p.getPrice().multiply(new BigDecimal("0.9")));
        ss.update(p);  // explicit - no dirty checking
    }
    ss.getTransaction().commit();
}