return highlight to response

[Akiler520]

return highlight to response

e.g.

    `$json = '{
            "query" : {
                    "match": { "name": "淳于理群" }
            },
            "highlight" : {
                "fields" : {
                    "name" : {}
                 }
            }
        }';
    $result = json_decode($json);

    $documents = ES::type('product_list')->body($result)->get();

    if ($documents){
        foreach ($documents as $document) {
            var_dump(json_encode($document->attributes));exit;
        }
    }

`

result:

    {
        "name":"淳于理群",
        "last_name":"",
        "age":57,
        "about":"淳于理群很喜欢足球，喜欢看报纸，也喜欢游泳",
        "interests":[
                "上网聊天",
                "滑雪"
            ],
        "_index":"product",
        "_type":"product_list",
        "_id":"06uFW2UB12PvfbBPiLfC",
        "_score":18.34602,
        "_highlight":{
                "name":[
                    "<em>淳</em><em>于</em><em>理</em><em>群</em>"
                ]
        }
    }