code: public function request($path, $method="GET", $payload=false) {
          return $this->call($this->buildUrl($path), $method, $payload);
      }
docs: Perform a request against the given path/method/payload combination
  Example:
  $es->request('/_status');
  
  @param string|array $path
  @param string $method
  @param array|bool $payload
  @return array