Elasticsearch query with groovy script

gistfile1.json

GET /my_data/data_type/_search
{
  "query": {
    "function_score": {
      "query": {
        "range": {
          "yearopened": {
            "gte": 2000
          }
        }
      },
      "functions": [
        {
          "script_score": {
            "lang": "groovy", 
            "script": "_score * doc['yearopened'].value.toInteger()"
          }
        }
      ]
    }
  }
}