public function testStringSearch()
{
$client = \ElasticSearch\Client::connection();
$tag = $this->getTag();
Helper::addDocuments($client, 3, $tag);
$resp = $client->search("title:{$tag}");
$this->assert->array($resp)->hasKey('hits')->array($resp['hits'])->hasKey('total')->integer($resp['hits']['total'])->isEqualTo(3);
}