Elastica\Document::create PHP Method

    public static function create($data)
    {
        if ($data instanceof self) {
            return $data;
        }
        if (is_array($data)) {
            return new self('', $data);
        }
        throw new InvalidException('Failed to create document. Invalid data passed.');
    }

 /**
  * @param \Elastica\Document|array $data
  *
  * @return $this
  */
 public function setUpsert($data)
 {
     $document = Document::create($data);
     $this->_upsert = $document;
     return $this;
 }