# How to: function\_score + script\_score + nested doc field?

**URL:** <https://discuss.elastic.co/t/how-to-function-score-script-score-nested-doc-field/153070>\
**Category:** Elasticsearch\
**Created:** [October 18, 2018, 9:03pm UTC](https://discuss.elastic.co/t/how-to-function-score-script-score-nested-doc-field/153070 "2018-10-18T21:03:15Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![jaddison](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@jaddison](https://discuss.elastic.co/u/jaddison)\
**Post date:** [October 18, 2018, 9:03pm UTC](https://discuss.elastic.co/t/how-to-function-score-script-score-nested-doc-field/153070/1 "2018-10-18T21:03:15Z")

</div>

Hey! It's nearing the end of 2018, and I'm wondering if there's a way to accomplish the following with ES 6.4.

I've got a `function_score` query with n `script_score` functions targeting top-level document fields and 1 `script_score` function targeting a `nested` doc field.

How can I achieve this in a single function\_score query? My understanding is that the nested doc value won't be found in its script score query due to the function\_score's query not being nested.

mapping:

```auto
{
   "activity-related-20181016-215041": {
      "mappings": {
         "doc": {
            "properties": {
               "events": {
                  "type": "nested",
                  "properties": {
                     "date_range": {
                        "type": "date_range"
                     },
                     "days_of_week": {
                        "type": "short"
                     }
                  }
               },
               "photo": {
                  "type": "keyword"
               },
               "relation": {
                  "type": "join",
                  "eager_global_ordinals": true,
                  "relations": {
                     "location": "activity"
                  }
               },
               "status": {
                  "type": "short"
               },
               "tags": {
                  "properties": {
                     "id": {
                        "type": "long"
                     },
                     "name": {
                        "type": "text",
                        "index": false
                     },
                     "slug": {
                        "type": "keyword"
                     }
                  }
               }
            }
         }
      }
   }
}

```

a query that has a `script_score` function targeting the nested value:

```auto
{
   "query": {
      "function_score": {
          "score_mode": "sum",
          "boost_mode": "replace",
         "query": {
            "term": {
                "relation": "activity"
            }
         },
         "functions": [
            {
               "script_score": {
                  "script": "for (long x : doc['events.days_of_week'].values) { if (x == 1) {return 100} } "
               }
            },
            {
               "script_score": {
                  "script": "for (long x : doc['tags.id'].values) { if (x == 1) {return 100} } "
               }
            },
            {
               "script_score": {
                  "script": "doc['photo'].value.length() > 0 ? 10 : 0"
               }
            },
            {
               "script_score": {
                  "script": "doc['status'].value >= 50 ? (doc['status'].value / 10 - 4) * 5 : 0"
               }
            }
         ]
      }
   }
}

```

Notice that the first two functions target `events. days_of_week` (a nested doc field) and `tags.id` (just an object field). The latter affects the score, while the former has no impact, due to nesting.

How can I achieve scoring that takes into account both document and nested document field data?

---

<div class="post-metadata">

**Author:** ![mayya](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mayya/32/83147_2.png) [@mayya](https://discuss.elastic.co/u/mayya)\
**Post date:** [October 26, 2018, 8:22pm UTC](https://discuss.elastic.co/t/how-to-function-score-script-score-nested-doc-field/153070/2 "2018-10-26T20:22:48Z")

</div>

No, unfortunately, you can't mix nested and top level docs for the same scoring - even at the end of 2018.

Nested objects are indexed as separate Lucene documents from their top-level document.  
Function\_score query works at the level of Lucene documents - processing each matched Lucene document at a time.

You can either:

1. Use a top level query for `function_score`, which returns only top-level documents and your `script_score` will calculate scores for them.
2. OR use a nested query with `inner_hits` and calculate `script_score` only for them:

```auto
{
  "query": {
    "nested": {
      "inner_hits": {},
      "path": "events",
      "query": {
        "function_score": {
          "script_score": {
            "script": {
              "source": "doc['events.days_of_week'].value"
            }
          }
        }
      }
    }
  }
}

```

Even if we had a query that will get us all documents - nested and top at the same time, still `function_score` will process separately one by one, and there would not be a way to access them in the same function.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 23, 2018, 8:22pm UTC](https://discuss.elastic.co/t/how-to-function-score-script-score-nested-doc-field/153070/3 "2018-11-23T20:22:52Z")

</div>

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