No alive nodes found in your cluster

I’m using a centos 7 server where I’ve installed nginx, php, mysql, elsaticsearch and ceated a magento setup.

In the magento admin > stores > Configuration > catalog > Catalog > Catalog Search I’m getting No alive nodes found in your cluster

Although the indexing is running properly and I can see it in Elasticsearch log.

Please let me know what I’m doing wrong over here.

Please have a look at the below given admin configuration.

When I’m calling from terminal this is what I’m getting

Below is the indexer result.