https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Entity%21SynchronizableEntityTrait.php/property/SynchronizableEntityTrait%3A%3AisSyncing/10
SynchronizableEntityTrait::$isSyncing | Drupal API
drupalapi
https://api.drupal.org/api/drupal/8.9.x/search/isSyncing
Search for isSyncing | Drupal API
search fordrupalapi