It is OK to have @NumericField on the ID field of an indexed entity:

@Indexed
@Entity
public class A {

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

}

This is working perfectly, the ID field is added as a numeric field to the index.
But if I have an indexed entity that inherits its ID from a parent entity, it does not work anymore:

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

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

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

Hibernate Search now fails with this error:
org.hibernate.search.exception.SearchException: HSEARCH000262: @NumericField annotation is used on xxx.B#id without a matching @Field annotation
at org.hibernate.search.engine.metadata.impl.NumericFieldsConfiguration.validate(NumericFieldsConfiguration.java:72)

There is no reason why this constellation should not be allowed, I think the only problem is that the numeric field validation does not take inherited ID fields of parent entities into account.