Command
curl -X POST 'http://localhost:9200/_aliases?pretty' -H 'Content-Type: application/json' -d '{"actions":[{"add":{"index":"my_index","alias":"current"}}]}'
Examples
Alias users index
curl -X POST 'http://localhost:9200/_aliases?pretty' -H 'Content-Type: application/json' -d '{"actions":[{"add":{"index":"users","alias":"active_users"}}]}'