Режим Hibernate Flu sh

Question

 Session session = null;
        Transaction transaction = null;
        try {
            session = HibernateUtil.getSessionFactory().openSession();
            session.setHibernateFlushMode(FlushMode.MANUAL);
            Person person = new Person();
            person.setFirstName("Java");
            person.setLastName("Hibernate");
            transaction = session.beginTransaction();
            session.save(person);
            BigInteger count = (BigInteger) session.createNativeQuery("select count(*) from Person")
                    .setHibernateFlushMode(FlushMode.MANUAL).getSingleResult();
            System.out.println("Total records are= " + count);
            transaction.commit();
        } catch (Exception e) {
            transaction.rollback();
            e.printStackTrace();
        } finally {
            if (session != null) {
                session.close();
            }
        }

Файл конфигурации Hibernate:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/db_practice</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">*****</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.format_sql">true</property>
        <property name="connection.autocommit">false</property>
        <mapping class="entities.Person"/>
    </session-factory>
</hibernate-configuration>

Я использую режим Hibernate Flu sh в качестве РУЧНОГО. Но метод save выполняет метод вставки, хотя я не вызываю метод session.flu sh (). Я использую hibernate 5.2.12 и mysql dirver 8.0.6

Output is below:
 Hibernate: 
   insert into  person (first_name, last_name) values (?, ?) 
 Hibernate: 
   select count(*) from Person 
 Total records are= 5

Класс HibenateUtil ниже:

public class HibernateUtil {
  private static StandardServiceRegistry standardServiceRegistry;
  private static SessionFactory sessionFactory;
  static{
        if (sessionFactory == null) {
          try {
            standardServiceRegistry = new StandardServiceRegistryBuilder().configure().build();
            MetadataSources metadataSources = new MetadataSources(standardServiceRegistry);
            Metadata metadata = metadataSources.getMetadataBuilder().build();
            sessionFactory = metadata.getSessionFactoryBuilder().build();
          } catch (Exception e) {
            e.printStackTrace();
            if (standardServiceRegistry != null) {
              StandardServiceRegistryBuilder.destroy(standardServiceRegistry);
            }
          }
        }
  }
  //Utility method to return SessionFactory
  public static SessionFactory getSessionFactory() {
      return sessionFactory;
  }
}

Класс HibernateUtil ниже Пожалуйста, помогите мне.