how to write elasticsearch script_score in java api

Question

I find a function in ElasticSearch like

GET /_search
{
  "function_score": {
    "functions": [
      { ...location clause... }, 
      { ...price clause... }, 
      {
        "script_score": {
          "params": { 
            "threshold": 80,
            "discount": 0.1,
            "target": 10
          },
          "script": "price  = doc['price'].value; margin = doc['margin'].value;
          if (price < threshold) { return price * margin / target };
          return price * (1 - discount) * margin / target;" 
        }
      }
    ]
  }
}

I use ScoreFunctionBuilder to achive the "location caluse" and "price caluse" ,but I do not know how to write "script_score" and "script" by java api
The ES version in my project is 2.2.0 and I use the java api to achieve this function
But I can not find the API like ScriptScoreFunctionBuilder. scriptFunction(String script, Map<String, Object> params) how can I do？ Thx :)
Finally I figure out how to write it by using JD-JUI to check the "elasticsearch.jar" file.

EX:

Map<String, Object> params = new HashMap<>();
    params.put("num1", 10);
    params.put("num2", 4);

    String inlineScript = "doc['score'].value * num1 * num2";

    Script script = new Script(script, ScriptType.INLINE, "groovy", params);

    ScriptScoreFunctionBuilder scriptBuilder = ScoreFunctionBuilders.scriptFunction(ss);

that's all

Rahul · Accepted Answer · 2016-03-17 17:08:27Z

1

Here is how you can implement scrip_ score function in java

Map<String, Object> params = new HashMap<>();                   
params.put("paramName1", "paramVal1")
params.put("paramName2", "paramVal2");

String script = "price  = doc['price'].value; margin = doc['margin'].value;
      if (price < threshold) { return price * margin / target };
      return price * (1 - discount) * margin / target;"
XContentBuilder builder = 
                    new ScriptScoreFunctionBuilder()
                    .script(script)
                    .lang("groovy")
                    .params(params)
                    .toXContent(XContentBuilder, params);

edited Mar 17, 2016 at 17:08

answered Mar 17, 2016 at 9:00

Rahul

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6 Comments

Jayan Over a year ago

Please add some details on why is this an answer.

kevin Over a year ago

Thank you so much for helping me, but the new ScriptScoreFunctionBuilder() does not work in my project. The API must be new ScriptScoreFunctionBuilder(Script) , it can not be write like your's ,only can write like new ScriptScoreFunctionBuilder(script).toXContent(builder, params) Am I use the wrong API? My english is poor ,sorry :(

Rahul Over a year ago

I am not able to understand. Why doesn't new ScriptScoreFunctionBuilder() work ? There is no other constructor. Also, you can always do new ScriptScoreFunctionBuilder().scrip(SCRIPT).toXContent(builder, params)

kevin Over a year ago

Because the public method of new ScriptScoreFunctionBuilder() must have args "Script" like new ScriptScoreFunctionBuilder(script),now I am working on how to write new ScriptScoreFunctionBuilder().scrip(SCRIPT).toXContent(builder, params)

Rahul Over a year ago

The class already has a public method which takes script as an argument. I have updated my answer to showcase.

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