Simple Node program using official library takes long time to terminate

Elastic Stack Elasticsearch
1

I have a simple program:

elasticsearch = require('elasticsearch');

client = new elasticsearch.Client({
hosts: 'localhost:9200',
log: 'trace'
});

client.ping({
requestTimeout: 1000,
// undocumented params are appended to the query string
hello: "elasticsearch!"
}, function (error) {
if (error) {
console.error('elasticsearch cluster is down!');
} else {
console.log('All is well');
}
});

It's just code taken from the elastic search website. But it takes several
minutes to terminate on its own.

Is there something else I need to include to terminate the program? I've
tried adding client.close() at the end but that doesn't do the trick.

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