I have two document types, in a parent-child relationship:
"myParent" : {
"properties" : {
"weight" : {
"type" : "double"
}
}
}
"myChild" : {
"_parent" : {
"type" : "myParent"
},
"_routing" : {
"required" : true
}
}
The weight field is to be used for custom scoring/sorting. This query
directly against the parent documents works as intended:
{
"query" : {
"function_score" : {
"script_score" : {
"script" : "_score * doc['weight'].value"
}
}
}
}
However, when trying to do similar scoring for the child documents with a
has_parent query, I get an error:
{
"query" : {
"has_parent" : {
"query" : {
"function_score" : {
"script_score" : {
"script" : "_score * doc['weight'].value"
}
}
},
"parent_type" : "myParent",
"score_type" : "score"
}
}
}
The error is:
QueryPhaseExecutionException[[myIndex][3]:
query[filtered(ParentQuery[myParent](filtered(function score
(ConstantScore(:),function=script[_score * doc['weight'].value], params
[null]))->cache(_type:myParent)))->cache(_type:myChild)],from[0],size[10]:
Query Failed [failed to execute context rewrite]]; nested:
ElasticSearchIllegalArgumentException[No field found for [weight] in
mapping with types [myChild]];
It seems like instead of taking the result of the scoring function and
applying it to the child, ES is taking the scoring function and applying
it to the child, hence the error.
If I don't use score for score_type, the error doesn't occur, although the
results scores are then all 1.0, as documented.
What am I missing here? How can I query these child documents with custom
scoring based on a parent field?
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