The new Doctrine\ODM\MongoDB\Aggregation\Builder::getAggregation() method
returns an Doctrine\ODM\MongoDB\Aggregation\Aggregation instance, comparable
to the Query class.
The Doctrine\ODM\MongoDB\Aggregation\Builder::execute() method was deprecated
and will be removed in ODM 3.0.
The Doctrine\ODM\MongoDB\Aggregation\Stage\Match and
Doctrine\ODM\MongoDB\Aggregation\Stage\GraphLookup\Match classes were
deprecated and replaced by Doctrine\ODM\MongoDB\Aggregation\Stage\MatchStage
and Doctrine\ODM\MongoDB\Aggregation\Stage\GraphLookup\MatchStage
respectively. This change was necessary due to match being a reserved keyword
in PHP 8. You must replace any usage of this class before you migrate to PHP 8.
Using @Index annotation(s) on a class level is a preferred way for defining
indexes for documents. Using @Index in the @Indexes annotation or an indexes
property of other annotations was deprecated and will be removed in ODM 3.0.
Using doctrine/cache to cache metadata is deprecated in favor of using PSR-6.
The getMetadataCacheImpl and setMetadataCacheImpl methods in
Doctrine\ODM\MongoDB\Configuration have been deprecated. Please use
getMetadataCacheand setMetadataCache with a PSR-6 implementation instead.
Note that even after switching to PSR-6, getMetadataCacheImpl will return a
cache instance that wraps the PSR-6 cache.