elastic search issue

/**
     * Returns an array of products IDs for products matching the search query
     *
     * @param string $query
     * @return array
     */
    public function search($query)
    {
        if (is_numeric($query)) {
            $return = $this->_client->search(
                array(
                    'index' => self::INDEX,
                    'type'  => self::TYPE,
                    'body'  => array(
                        'query' => array(
                            'multi_match' => array(
                                'query'  => $query,
                                'fields' => array('id', 'barcodes'),
                            ),
                        ),
                        'size' => '5000',
                    ),
                )
            );
        } else {
            $search = array(
                'index' => self::INDEX,
                'type'  => self::TYPE,
            );

            $words = explode(' ', $query);

            foreach ($words AS $word) {
                $search['body']['query']['bool']['should'][] = array('wildcard' => array(
                        'name' => array(
                            'value' => $word.'*',
                        ),
                    )
                );
                $search['body']['query']['bool']['should'][] = array('wildcard' => array(
                        'brand' => array(
                            'value' => $word.'*',
                            'boost' => '10',
                        ),
                    )
                );
            }

            $search['body']['size'] = 5000;

            $return = $this->_client->search($search);

        }
        dd($return);
        $productIds = array();

        if (!empty($return['hits']['hits'])) {
            foreach ($return['hits']['hits'] as $hit) {
                $productIds[] = $hit['_id'];
            }
        }

        return $productIds;
    }