Correct connection settings for ElasticSearch / Django-Haystack on Bonsai.io

I should have read the documentation about this better, so I'm blogging this because I'm sure other people have had the same issue. Bonsai.io requires the username and password to be sent as an http_auth header.

from urlparse import urlparse

es = urlparse(os.environ.get('BONSAI_URL'))
port = es.port or 80

HAYSTACK_CONNECTIONS = {
    'default': {
        'ENGINE': 'haystack.backends.elasticsearch_backend.ElasticsearchSearchEngine',
        'URL': es.scheme + '://' + es.hostname + ':' + str(port),
        'INDEX_NAME': 'your_index_name',
    },
}

if es.username:
    HAYSTACK_CONNECTIONS['default']['KWARGS'] = {"http_auth": es.username + ':' + es.password}