gistfile1.json

{
    "query": {
        "filtered": {
            "query": {
               "multi_match": {
                   "query": "something",
                   "fields": ["title", "url", "description"]
               }
            },
            "filter": {
               "bool": {
                    "must": {
                        "missing": {
                            "field": "marked_for_deletion"
                        }
                    }
                }
            }
        }
    },
    "boosting": {
        "positive": {
            "filter": {
                "bool": {
                    "must": {
                        "exists": {
                            "field": "traded_as"                            
                        }
                    }
                }
            }
        },
        "negative": {
            "filter": {
               "bool": {
                    "must": {
                        "missing": {
                            "field": "traded_as"
                        }
                    }
                }
            }
        },
        "negative_boost": 1.0
    }
}