1) Create es domain -
# aws --endpoint-url=http://localhost:4566 es create-elasticsearch-domain --domain-name dev-domain --elasticsearch-version 6.8.1
(Note: It take around 5-10 min to up the domain in localstack)

2) Check if domain is up or not(Default port is 4571) -
# curl -X GET "http://localhost:9200"

3) Create new index in your domain - 
# curl -X PUT "localhost:9200/newindex?pretty"

4) List all indices from your domain -
# curl -X GET "http://localhost:9200/_cat/indices?pretty"

5) List all elasticsearch domains - 
# aws --endpoint-url=http://localhost:4566 es list-domain-names

6) Delete domain from elasticsearch - 
# aws --endpoint-url=http://localhost:4566 es delete-elasticsearch-domain --domain-name dev-domain