title: Is there an annotation to define a multi column index in jpa2
body: <p>Hibernate provides a mechanism to define multi column indexes via the <a href="http://docs.jboss.org/hibernate/stable/annotations/api/org/hibernate/annotations/Table.html#indexes()" rel="noreferrer">Table</a>. Is there a way to specify this is an ORM agnostic fashion via JPA or JPA2 (e.g. using the javax.persistence.* APIs)</p>