• BC BREAK: Doctrine\Listener#scheduleForDeletion access changed to private.
• BC BREAK: ObjectPersisterInterface gains the method handlesObject that
  returns a boolean value if it will handle a given object or not.
• BC BREAK: Removed Doctrine\Listener#getSubscribedEvents. The container
  configuration now configures tags with the methods to call to avoid loading
  this class on every request where doctrine is active. #729
• BC BREAK: Added methods for retrieving aggregations when paginating results.
  The PaginationAdapterInterface has a new method, getAggregations. #726
• Added ability to configure date_detection, numeric_detection and
  dynamic_date_formats for types. #753
• New event POST_TRANSFORM which allows developers to add custom properties to
  Elastica Documents for indexing.
• When available, the fos:elastica:populate command will now use the
  ProgressBar helper instead of outputting strings. You can use verbosity
  controls on the command to output additional information like memory
  usage, runtime and estimated time.
• Added new option property_path to a type property definition to allow
  customisation of the property path used to retrieve data from objects.
  Setting property_path to false will configure the Transformer to ignore
  that property while transforming. Combined with the above POST_TRANSFORM event
  developers can now create calculated dynamic properties on Elastica documents
  for indexing. #794
• Fixed a case where ProgressCommand would always ignore errors regardless of
  --ignore-errors being passed or not.
• Added a SliceFetcher abstraction for Doctrine providers that get more
  information about the previous slice allowing for optimising queries during
  population. #725
• New events PRE_INDEX_POPULATE, POST_INDEX_POPULATE, PRE_TYPE_POPULATE and
  POST_TYPE_POPULATE allow for monitoring when an index is about to be or has
  just been populated. #744
• New events PRE_INDEX_RESET, POST_INDEX_RESET, PRE_TYPE_RESET and
  POST_TYPE_RESET are run before and after operations that will reset an
  index. #744
• Added indexable callback support for the __invoke method of a service. #823