@Entity
@Indexed
public class Group{
   @Field
   private boolean someBoolean;

   @OneToMany(mappedBy="group")
   @ContainedIn
   private Set<Base> comments;
}

@Entity
@Indexed
public abstract class Base{
   
   @ManyToOne
   @IndexedEmbedded(includePaths={"someBoolean"})
    private Group group;
}

@Entity
@Indexed
public class Comment extends Base{

   @ManyToOne
   private Post post;
}

@Entity
@Indexed(interceptor=PostIndexingInterceptor.class)
public class Post extends Base{

    @OneToMany(mappedBy="post")
    private Set<Comment> comments;
}

public class PostIndexingInterceptor implements EntityIndexingInterceptor<Post> {
[...]
}