Name of the event triggered for field storage definition update.
This event allows you to respond anytime a field storage definition is updated. The event listener method receives a \Drupal\Core\Field\FieldStorageDefinitionEvent instance.
\Drupal\Core\Field\FieldStorageDefinitionEvent
\Drupal\Core\Entity\EntityManager::onFieldStorageDefinitionUpdate()
\Drupal\Core\Field\FieldStorageDefinitionEventSubscriberTrait
const UPDATE = 'field_storage.definition.update';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldStorageDefinitionEvents.php/constant/FieldStorageDefinitionEvents::UPDATE/8.1.x