Django with mongoengine backend and elasticsearch via haystack

I am using mongoengine as my backend. I am trying to merge a haystack using elasticsearch to index my mongo documents. I am following the documentation http://django-haystack.readthedocs.org/ .

When I ran

./manage.py rebuild_index

Removing all documents 

from your index because you said so.
All documents removed.
/home/t/py/django/boxers/venv/local/lib/python2.7/site-packages/haystack/utils/loading.py:165: UserWarning: Installed app kombu.transport.django.KombuAppConfig is not an importable Python module and will be ignored
  warnings.warn('Installed app %s is not an importable Python module and will be ignored' % app)

      

        
        
        
      

    

My haystack django is 2.3.1