Overrides \Drupal\Core\Entity\Query\QueryBase::condition().
Additional to the syntax defined in the QueryInterface you can use placeholders (*) to match all keys of an subarray. Let's take the follow yaml file as example:
level1:
level2a:
level3: 1
level2b:
level3: 2
Then you can filter out via $query->condition('level1.*.level3', 1).
Overrides QueryBase::condition
public function condition($property, $value = NULL, $operator = NULL, $langcode = NULL) {
return parent::condition($property, $value, $operator, $langcode);
}