Update: posted to Stack Overflow with bounty:
http://stackoverflow.com/questions/21289149/trouble-with-has-parent-query-containing-scripted-function-score
On Thursday, January 16, 2014 11:11:27 AM UTC-5, Paul Bellora wrote:
>
> 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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