@MappedSuperclass
class BaseContent{
  @IndexedEmbedded(includePaths = {"id", "name"}) @ManyToOne
  Author author;
}
@Entity @Indexed
class Content extends BaseContent{
  @Id @DocumentId
  Integer id;
}
@Entity
class Author{
  @Id
  Integer id;
  @Field(store = Store.YES)
  String name;
}