Elasticsearch的Groovy Script自定义评分检索

需求：以索引中的boostapp列作为评分的基础分值，同时根据carpublishtime（数据的刷新时间字段）按时间进行衰减。

基于Groovy脚本实现。

1、query脚本方式：

{
  "fields": [
    "boost",
    "ucarid",
    "boostapp",
    "carpublishtime"
  ],
  "query": {
    "function_score": {
      "query": {
        "match_all": {}
      },
      "functions": [
        {
          "script_score": {
            "script": "import java.util.Date;import java.text.DateFormat;import java.text.SimpleDateFormat;time2=((new Date().getTime()- new SimpleDateFormat('yyyy-MM-dd HH:mm:ss').parse(_source.carpublishtime.replace('T',' ')).getTime())/60000);if(time2<=60)_source.boostapp+time2/5 else if(time2<=120)_source.boostapp+(time2/10-6)*8 else if(time2<=180)_source.boostapp+(time2/10-12)*5 else _source.boostapp"
          }
        }
      ],
      "boost_mode": "replace",
      "score_mode": "sum"
    }
  },
  "from": 0,
  "size": 10
}

　　

2、Nest方式：

QueryContainer mainQuery = null;
FunctionScoreQuery funcQuery = new FunctionScoreQuery();
funcQuery.ScoreMode = FunctionScoreMode.Sum;
funcQuery.BoostMode = FunctionBoostMode.Replace;
funcQuery.MaxBoost = 1000.0f;
ScriptFilter scriptFilter = new ScriptFilter();
scriptFilter.Script = "import java.util.Date;import java.text.DateFormat;import java.text.SimpleDateFormat;time2=((new Date().getTime()- new SimpleDateFormat('yyyy-MM-dd HH:mm:ss').parse(_source.carpublishtime.replace('T',' ')).getTime())/60000);if(time2<=60)_source.boostapp+time2/5 else if(time2<=120)_source.boostapp+(time2/10-6)*8 else if(time2<=180)_source.boostapp+(time2/10-12)*5 else _source.boostapp";
funcQuery.ScriptScore = scriptFilter;
mainQuery &= funcQuery;