gistfile1.txt

{
    "fields": [
        "id", 
        "name", 
        "title", 
        "description", 
        "url", 
        "domain"
    ], 
    "query": {
        "custom_score": {
            "params": {
                "tags": [
                    "twitter"
                ]
            }, 
            "query": {
                "filtered": {
                    "filter": {
                        "terms": {
                            "tags": [
                                "twitter"
                            ]
                        }
                    }, 
                    "query": {
                        "match_all": {}
                    }
                }
            }, 
            "script": "tot = _score; foreach(tag : tags) { tot += doc[tags][tag].value; } return tot;"
        }
    }
}