Moose type unions in Elastic::Model

emtu_mwe.pl

package MyApp;
use Elastic::Model;
has_namespace 'myapp' => {
    user => 'MyApp::User',
};

package Class1;
use Moose;

package Class2;
use Moose;

package MyApp::User;
use Elastic::Doc;
has 'attr' => (is => 'rw', isa => 'Class1|Class2');

package main;
my $model       = MyApp->new;
my $esdomain	= $model->domain('myapp');
$esdomain->create(
	'user' => {
		attr => Class1->new,
	});

__END__
No deflator found for attribute (name) in class MyApp::User at /home/andrefs/.perl5/perls/perl-5.16.2/lib/site_perl/5.16.2/Elastic/Model/TypeMap/Base.pm line 66.