No alive nodes found in elastic cluster

Here is my issue:

Both the modules Elastic Search Connector and Elastic AWS Connector installed fine. Now, when I try to add a Search API index to index the data to my cluster located in Amazon ES it throws an error : No alive nodes found in elastic cluster.

I read that Amazon ES runs on port 80 or 443. I tried with both by appending the port number after the colon at the end point of elastic server but still getting the same error.

Error Message Elasticsearch\Common\Exceptions\NoNodesAvailableException: No alive nodes found in your cluster in Elasticsearch\ConnectionPool\StaticNoPingConnectionPool->nextConnection() (line 51 of /srv/bindings/5ee7baa98f574fc38717ec1fd49da919/code/vendor/elasticsearch/elasticsearch/src/Elasticsearch/ConnectionPool/StaticNoPingConnectionPool.php).