Change elastic documents dynamically using Java High Level REST client

Question

My main purpose is to update an existing document in ElasticSearch, via Java High Level REST Client.

For this task, I'm using UpdateByQueryRequest, and sets a Script which modifies the relevant docs.

My question is, if I can set the fields and their new values dynamically:

public Script buildUpdateQueryScript(Map<String,String> updatedValues) {

        String script = "";
       
        updatedFields.forEach((key,value) -> script.concat("ctx._source.").concat(key).concat(" = ").concat(value) );


        return new Script(
            ScriptType.INLINE,
            "painless",
            script,
            Collections.emptyMap()
        );

    }

So for example if my Map contains one element ("keyOne","valueOne"), then script would be as follows:

"ctx._source.keyOne = valueOne"

This is not working of course, I would like to know if this is even possible to build the script dynamically, and if so, what is the right way to do it?

Answer 1

I've found an answer for this, I will post it here so you'll have a reference for similar issues:

Map<String, Object> params = new HashMap<>();
        params.put("keyOne", "valueOne");
        params.put("keyTwo", "valueTwo");


for (String key : params.keySet()) {
            script = script + "ctx._source." + key + " = params." + key + ";";
        }

return new Script(
            ScriptType.INLINE,
            "painless",
            script,
            params
        );