custom_score query within has_child query does not recognize child document fields within the script property

[apasumarthi]

custom_score query within has_child query does not recognize child document fields within the score script.

I have two document types, "Forums" and "ForumStats". Forums is a parent type and ForumStats is a child type. I had set the mapping correctly.

When I issue query like the one below on forums type, ES complains that the field "avgPostsPerMinute" is not found in "Forums" type, which I feel is wrong as the script is supposed to look at child document fields.

Note: "avgPostsPerMinute" field belongs to ForumStats type.

{
"size": 20,
"sort": {
"_score": "desc"
},
"query": {
"has_child": {
"type": "forumstats",
"score_type": "sum",
"query": {
"custom_score": {
"script": "doc['avgPostsPerMin'].value",
"query": {
"match_all": {}
}
}
}
}
}
}

If I set the script to a value that doe snot refer to child document type, then the query runs and I get a score for the parent document correctly.

Please review this and let me know if this is by design or a bug. If it is by design, it looks odd as the custom score query is running on child documents and I would expect ES to recognize the child document fields within the script property.

Thanks & Regards,
Aditya.

[imotov]

@apasumarthi this is known issue. The script in the custom_score query inside has_child is working in context of the parent query. So, you need to use fully qualified field names:

    "custom_score": {
        "script": "doc['forumstats.avgPostsPerMin'].value",

See working example here.

[apasumarthi]

Thanks Igor.

I was able to figure out the same (with little hunch). Hopefully the actual issue will be fixed soon.

[fanbiao]

i have the same problem abount has_child

[clintongormley]

This has been fixed in #5838