What's the difference between accessing a document field via .value/.values or not in painless script?

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1

Suppose that i have a doc mapping field like below

{
    "template": {
        "mappings":{
            "template":{
                "properties": {
                    "sth": {
                        "type": "long"
                    }
                }
            }
        }
    }
}

The field sth is the type of array.

I want to check whether the field sth contains a value or not, so i write painless script like doc['sth'].values.contains((long)1)

It works. However, if i write doc['sth'].contains((long)1) , accessing the field not via .values , it also can works.

I've also tried some instance method like isEmpty() , size() , both can work whether via .values or not.

So, what's the difference between accessing a document field via .value/.values or not in painless script? What does painless do under the hood?

Here's the relation topic on stackoverflow.

2

Historically .values was the way to access multiple values. However, the return type of doc was changed to be a List of values, so .values was redundant, as you found. For this reason, we removed .values in recent versions (maybe 7.0, I don't remember for sure).

3

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