AWS open search compatibility (should be quick to fix) about django-haystack

[AnnaBNana]

@ajwillo tested according to specs listed below, and I am unable to reproduce your error. When I run ./manage.py rebuild_index I am able to successfully write to an OpenSearch index. Without more detail on how you configured your OpenSearch domain, it is hard to say what the problem is here. Here are the details on how my application is set up:

Django==4.1.7
django-haystack==3.2.1
elasticsearch==7.13.3
Python 3.11.0b5

settings.py

HAYSTACK_CONNECTIONS = {
    'default': {
        'ENGINE': 'haystack.backends.elasticsearch7_backend.Elasticsearch7SearchEngine',
        'URL': <DOMAIN-ENDPOINT>,
        'INDEX_NAME': 'haystack',
        'KWARGS': {
            'port': 443,
            'http_auth': (USERNAME, PASSWORD),
        }
    },
}

I configured my OpenSearch instance as a test domain, according to instructions found here https://docs.aws.amazon.com/opensearch-service/latest/developerguide/gsgcreate-domain.html

During setup I selected Enable compatibility mode, as it sounded like this might be required since I used version 7.x on the application side. My only thought is you may need to configure your OpenSearch domain differently to get this working. Hope this helps, don't hesitate to reach out, would be happy to help you troubleshoot.