old_contents: import logging
  
  from django.conf import settings
  from django.db.models.signals import pre_delete
  
  from elasticutils.contrib.django.tasks import index_objects, unindex_objects
  
  from wiki.signals import render_done
  
  
  def render_done_handler(**kwargs):
      if not settings.ES_LIVE_INDEX or 'instance' not in kwargs:
          return
      instance = kwargs['instance']
      try:
          index_objects.delay(instance.get_mapping_type(), [instance.id])
      except:
          logging.error('Search indexing task failed',
                        exc_info=True)
  
  
  def pre_delete_handler(**kwargs):
      if not settings.ES_LIVE_INDEX or 'instance' not in kwargs:
          return
      instance = kwargs['instance']
      unindex_objects.delay(instance.get_mapping_type(), [instance.id])
  
  
  def register_live_index(model_cls):
      """Register a model and index for auto indexing."""
      uid = str(model_cls) + 'live_indexing'
      render_done.connect(render_done_handler, model_cls, dispatch_uid=uid)
      pre_delete.connect(pre_delete_handler, model_cls, dispatch_uid=uid)
      # Enable this to be used as decorator.
      return model_cls
  
new_contents: import logging
  import warnings
  
  from django.conf import settings
  from django.db.models.signals import pre_delete
  
  # ignore a deprecation warning from elasticutils until the fix is released
  # refs https://github.com/mozilla/elasticutils/pull/160
  warnings.filterwarnings("ignore",
                          category=DeprecationWarning,
                          module='celery.decorators')
  
  from elasticutils.contrib.django.tasks import index_objects, unindex_objects
  
  from wiki.signals import render_done
  
  
  def render_done_handler(**kwargs):
      if not settings.ES_LIVE_INDEX or 'instance' not in kwargs:
          return
      instance = kwargs['instance']
      try:
          index_objects.delay(instance.get_mapping_type(), [instance.id])
      except:
          logging.error('Search indexing task failed',
                        exc_info=True)
  
  
  def pre_delete_handler(**kwargs):
      if not settings.ES_LIVE_INDEX or 'instance' not in kwargs:
          return
      instance = kwargs['instance']
      unindex_objects.delay(instance.get_mapping_type(), [instance.id])
  
  
  def register_live_index(model_cls):
      """Register a model and index for auto indexing."""
      uid = str(model_cls) + 'live_indexing'
      render_done.connect(render_done_handler, model_cls, dispatch_uid=uid)
      pre_delete.connect(pre_delete_handler, model_cls, dispatch_uid=uid)
      # Enable this to be used as decorator.
      return model_cls
  
subject: Stop a deprecation warning that is thrown in elasticutils.