has_parent with function_score

test.sh

curl -XDELETE "http://localhost:9200/_all"

curl -XPUT "http://localhost:9200/test1" -d'
{
    "mappings": {
        "parent" : {
            "properties": {
                "weight" : {
                    "type": "double"
                }
            }
        },
        "child" : {
            "_parent": {
               "type": "parent"
            }
        }
    }
}'

curl -XPUT "http://localhost:9200/test1/parent/1" -d'
{
    "weight" : 5
}'

curl -XPUT "http://localhost:9200/test1/child/1?parent=1" -d'
{
    "field" : "value"
}'

curl -XPUT "http://localhost:9200/test1/child/2?parent=1" -d'
{
    "field" : "value"
}'

curl -XPOST "http://localhost:9200/test1/_search" -d'
{
    "query" : {
        "has_parent" : {
            "query" : {
                "function_score" : {                                                    
                    "script_score" : {
                        "script" : "_score * doc[\"weight\"].value"
                    }
                }
            },
            "parent_type" : "parent",
            "score_type" : "score"
        }
    }
}'