Order the bucket by max score of document in Aggregations V1.0.RC2

Elastic Stack Elasticsearch
1

Hi all,

Have you ever tried to order the bucket by field _score of documents given
a query?

I took example from http://blog.qbox.io/elasticsearch-aggregations and make
the query:
curl -XPOST "http://localhost:9200/sports/athlete/_search" -d '{
"query" : {
"match" : { "sport" : "baseball" }
},

"size": 0,
"aggs": {
"sport": {
"terms": {
"field": "sport",
"size": 5,
"order" : { "max_score" : "desc" }
},
"aggs" : {
"max_score" : { "max" : { "field" : "_score" } }
}
}
}
}'

However in the response i see:

"aggregations": {
    "sport": {
        "buckets": [{
            "key": "baseball",
            "doc_count": 16,
            "max_score": {
                "value": null
            }
        }]
    }
}

I know that the 1st document in result list has score 2.098612 for that
query so why max_score is null in aggregations?

Thanks for your help.
Toan.

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2

Hi,

The score is not a field of a document but is computed dynamically, you
need to use a script to get it. So replacing { "field" : "_score" } with
{ "script" : "_doc.score" } should have the desired effect.

On Fri, Feb 7, 2014 at 2:57 AM, Toan V Luu luuvinhtoan@gmail.com wrote:

Hi all,

Have you ever tried to order the bucket by field _score of documents
given a query?

I took example from http://blog.qbox.io/elasticsearch-aggregations and
make the query:
curl -XPOST "http://localhost:9200/sports/athlete/_search" -d '{
"query" : {
"match" : { "sport" : "baseball" }
},

"size": 0,
"aggs": {
"sport": {
"terms": {
"field": "sport",
"size": 5,
"order" : { "max_score" : "desc" }
},
"aggs" : {
"max_score" : { "max" : { "field" : "_score" } }
}
}
}
}'

However in the response i see:

"aggregations": {
    "sport": {
        "buckets": [{
            "key": "baseball",
            "doc_count": 16,
            "max_score": {
                "value": null
            }
        }]
    }
}

I know that the 1st document in result list has score 2.098612 for that
query so why max_score is null in aggregations?

Thanks for your help.
Toan.

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.
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--
Adrien Grand

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