AWS OpenSearch Service (aka Elasticsearch Service) is a managed service that makes it easy to deploy, operate, and scale OpenSearch clusters in the AWS Cloud.
An OpenSearch Service Domain is basically an OpenSearch cluster. Domains are clusters with the settings, instance types, instance counts, and storage resources that you specify.
After setting up a Domain, you’ll get an endpoint that looks like:
https://search-my-domain.us-east-1.es.amazonaws.com
You can add a single document to the movies domain with curl:
curl -XPUT -u 'master-user:master-user-password' 'domain-endpoint/movies/_doc/1' -d '{"director": "Burton, Tim", "genre": ["Comedy","Sci-Fi"], "year": 1996, "actor": ["Jack Nicholson","Pierce Brosnan","Sarah Jessica Parker"], "title": "Mars Attacks!"}' -H 'Content-Type: application/json'
https://docs.aws.amazon.com/opensearch-service/latest/developerguide/indexing.html