ElasticSearch PHP client v2.0 keeps throwing “No alive nodes found in your cluster”

Elastic Stack Elasticsearch
3

I am assuming this is what installing it is doing: I got the certificate and now I point to it. This is the config and calling the delete action which throws the "...no alive nodes..." exception:

require 'autoload.php'; //to call the cert installer autoloader

$hosts = ['https://localhost:9200'];
$caBundle = \Kdyby\CurlCaBundle\CertificateHelper::getCaInfoFile();

print "

"; print_r($caBundle); print "
";

require '../vendor/autoload.php'; //call the PHP ElasticSearch API vendor autoload

$client = Elasticsearch\ClientBuilder::create()
->setHosts($hosts)
->setSSLVerification($caBundle)
->build();

print "client var is: 

"; print_r($client); print "
";

try {
$client -> indices() -> delete(array('index' => 'er'));
} catch (Exception $e) {
print "

"; print_r($e); print "
";
return;
}

echo "DONE";