#DocumentId on a Non-#Id Field Seems to Make Indexing Invalid for Existing Data in Database - hibernate-search

Question

I have a class named Book that contains 2 fields, id and isbn.
And I want to perform normal Hibernate queries using the id field as the primary key, while perform Hibernate Search queries using the isbn field as the primary key.
So I put the #Id annotation on the id field and the #DocumentId annotation on the isbn field, as follows.
#Entity
#Indexed
public class Book {
#Id
private Long id;
#DocumentId(name = "_documentId")
#Field(index = Index.YES, analyze = Analyze.YES, store = Store.YES)
private Long isbn;
...
}
Then I found that, after the Hibernate Search indexing process starts, although all new updates to the Book entities are correctly indexed, the existing Book entities in the database are not indexed.
And after I move the #DocumentId annotation from the isbn field onto the the id field as follows, the existing Book entities in the database will be indexed again when the Hibernate Search indexing process starts.
#Entity
#Indexed
public class Book {
#Id
#DocumentId(name = "_documentId")
private Long id;
#Field(index = Index.YES, analyze = Analyze.YES, store = Store.YES)
private Long isbn;
...
}
So my question is
Can the Hibernate Search indexing process work same as before, even when the #DocumentId and #Id annotations are on different fields?.
I use the Luke to check the Hibernate Search index.
Libraries
hibernate-search-orm: 5.5.4.Final
hibernate-core: 5.0.3.Final
jdk: 1.7.0_79
Code
Entity Class
Book.java
#Entity
#Indexed
public class Book {
#Id
private Long id;
#DocumentId(name = "_documentId")
#Field(index = Index.YES, analyze = Analyze.YES, store = Store.YES)
private Long isbn;
#Field(index = Index.YES, analyze = Analyze.YES, store = Store.YES)
private int version;
#Field(index = Index.YES, analyze = Analyze.YES, store = Store.YES)
private String content;
public Book() {
}
public Book(Long isbn, int version, String content) {
this.isbn = isbn;
this.version = version;
this.content = content;
}
#Override
public String toString() {
return "Book [id=" + id + ", isbn=" + isbn + ", version=" + version + ", content=" + content + "]";
}
// Getters and setters...
}
Hibernate Mapping File
Book.hbm.xml
<hibernate-mapping package="com.raychen518.study.hibernate">
<class name="Book" table="BOOKS">
<id name="id" column="ID">
<generator class="increment" />
</id>
<property name="isbn" column="ISBN" />
<property name="version" column="VERSION" />
<property name="content" column="CONTENT" />
</class>
</hibernate-mapping>
Hibernate Configuration File
hibernate.cfg.xml
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">org.postgresql.Driver</property>
<property name="connection.url">jdbc:postgresql://localhost:5432/test</property>
<property name="connection.username">postgres</property>
<property name="connection.password">admin</property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">validate</property>
<property name="hibernate.search.lucene_version">LUCENE_CURRENT</property>
<property name="hibernate.search.default.directory_provider">filesystem</property>
<property name="hibernate.search.default.indexBase">hibernate.search.test/lucene/indexes</property>
<mapping resource="Book.hbm.xml" />
</session-factory>
</hibernate-configuration>
Application Launcher Class
BookManager.java
After executing the main(String[]) method in the class, the Book entity which the isbn field is 789 will be created in the index while the existing Book entities (in database) which the isbn fields are 123 and 456 respectively are not indexed.
public class BookManager {
public static void main(String[] args) throws InterruptedException {
BookManager manager = new BookManager();
manager.startIndexing();
manager.saveSome();
}
private void startIndexing() throws InterruptedException {
FullTextSession fullTextSession = Search.getFullTextSession(HibernateUtil.getSessionFactory().openSession());
fullTextSession.createIndexer(Book.class).startAndWait();
}
public void saveSome() {
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
// session.save(new Book(123L, 1, "abc"));
// session.save(new Book(456L, 1, "def"));
session.save(new Book(789L, 1, "ghi"));
session.getTransaction().commit();
session.close();
}
}
HibernateUtil.java
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
return new MetadataSources(registry).buildMetadata().buildSessionFactory();
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}