Elasticsearch function_score with nested_objects

Question

I have a problem with a query.I used a query for boosting documents with no nested_objects. Now i use nested_objects and changed the query to use a nested filter but nothing is boosted. I get the documents i expected but with no _score changes.

Am i doing something wrong ??

GET index/type/_search
{
   "query": {
      "function_score": {
         "filter": {
            "bool": {
               "must": [
                  {
                     "term": {
                        "parent.child": "test"
                     }
                  }
               ]
            }
         },
         "functions": [
            {
               "boost_factor": "100",
               "filter": {
                  "nested": {
                     "path": "parent",
                     "filter": {
                        "bool": {
                           "must": [
                              {
                                 "term": {
                                    "child": "test"
                                 }
                              }
                           ]
                        }
                     }
                  }
               }
            }
         ],
         "score_mode": "sum"
      }
   },
   "sort": "_score",
   "from": 0,
   "size": 320
}

EDIT: Could it be caused by

nested filter

A nested filter behaves much like a nested query, except that it doesn’t accept the score_mode parameter. It can only be used in “filter context” — such as inside a filtered query — and it behaves like any other filter: it includes or excludes, but it doesn’t score.

While the results of the nested filter itself are not cached, the usual caching rules apply to the filter inside the nested filter.

http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/nested-query.html

Stillmatic1985 · Accepted Answer · 2014-08-12 14:01:59Z

2

As the documentation says:

nested filter

A nested filter behaves much like a nested query, except that it doesn’t accept the score_mode parameter. It can only be used in “filter context” — such as inside a filtered query — and it behaves like any other filter: it includes or excludes, but it doesn’t score.

While the results of the nested filter itself are not cached, the usual caching rules apply to the filter inside the nested filter.

http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/nested-query.html

answered Aug 12, 2014 at 14:01

Stillmatic1985

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Comments

Jonathan Lerner · Accepted Answer · 2014-08-07 14:12:57Z

0

I get the feeling your JSON should look closer this (maybe not exactly though, I havent tested it).

{
   "query": {
      "function_score": {
         "query": {
           "nested": {
               "path": "parent",
               "query": {
                  "bool": {
                     "must": [
                        {
                           "term": {
                              "parent.child": "test"
                           }
                        }
                     ]
                  }
               }
            }
         },
         "functions": [
            {
               "boost_factor": "100"
            }
         ],
         "score_mode": "sum"
      }
   },
   "sort": "_score",
   "from": 0,
   "size": 320
}

Specifically, you dont want to filter the boost_factor, you just want to boost this function_score by 100. The actual nested query though goes in the query section of the function_score, and the functions section just contains the boost_factor. I think.

answered Aug 7, 2014 at 14:12

Jonathan Lerner

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2 Comments

Stillmatic1985 Over a year ago

The query works as expected if i remove the nested part and boost on a root field.

Jonathan Lerner Over a year ago

In the nested query, shouldnt it still be "parent.child": "test" and not "child": "test"? In terms of the actual problem, sorry, I cant actually test stuff right now :( Ill delete my answer

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