Usually, an operation that retrieves a queryset of pages (such as ``homepage.get_children()``) will return them as basic Page instances, which only include the core page data such as title. The ``specific()`` method (e.g. ``homepage.get_children().specific()``) now allows them to be retrieved as their most specific type, using the minimum number of queries.
* Search backends can now be specified by module (e.g. ``wagtail.wagtailsearch.backends.elasticsearch``), rather than a specific class (``wagtail.wagtailsearch.backends.elasticsearch.ElasticSearch``)