The selection plugin group.
This property is used to allow selection plugins to target a specific entity type while also inheriting the code of an existing selection plugin. For example, if we want to override the NodeSelection from the 'default' selection type, we can define the annotation of a new plugin as follows:
id = "node_advanced", entity_types = {"node"}, group = "default", weight = 5
Type: string
public $group;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Annotation!EntityReferenceSelection.php/property/EntityReferenceSelection::group/8.1.x