A type in elastic search is approximately equivalent to a table or collection
in a relational datastore. While an index can have multiple types, this ODM maps
each type in an index maps to a class.
Inheritance:
implementsCake\Datasource\RepositoryInterface, implementsCake\Event\EventDispatcherInterface, use traitCake\Event\EventManagerTrait, use traitCake\Datasource\RulesAwareTrait, use traitCake\Validation\ValidatorAwareTrait