Hey Yoann,

I just figured out this only happens when there is another abstract class in the inheritance hierarchy:

@Indexed
@Entity
...
public abstract class A {

	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@NumericField
	@SortableField
	public Long getId() {
		return id;
	}
	...
}

@Indexed
@Entity
...
public abtract class B extends A {
	...
}

@Indexed
@Entity
...
public class C extends B {
	...
}

The error is then thrown for class C:

org.hibernate.search.exception.SearchException: HSEARCH000262: @NumericField annotation is used on xxx.C#id without a matching @Field annotation
	at org.hibernate.search.engine.metadata.impl.NumericFieldsConfiguration.validate(NumericFieldsConfiguration.java:72)

A few questions regarding your comments about the document ID:

• Are those known issues also relevant when using Elasticsearch as backend, or only when using the old Lucene backend?
• What exactly does not work when trying to sort the document ID? Is this documented somewhere?
• Are there any other important issues with a numeric document ID you did not mention?

Thanks!!