Have JipiJapa enable Hibernate Search backward compatibility properties

For Hibernate Search 5.10.x to be fully backwards compatible with the previous versions included in WildFly, we need the following property to be set by default among the Hibernate ORM configuration properties:

hibernate.search.index_uninverting_allowed=true

When set to true and the mapping actually makes use of this feature, a warning will be logged.

We probably will want to document this as well: recommend users to set it to "false" explicitly, as relying on this feature has a performance penalty, yet no relying on it requires mapping changes.