# Using function\_score in Kibana 4 search

**URL:** <https://discuss.elastic.co/t/using-function-score-in-kibana-4-search/1695>\
**Category:** Kibana\
**Created:** [June 2, 2015, 9:00am UTC](https://discuss.elastic.co/t/using-function-score-in-kibana-4-search/1695 "2015-06-02T09:00:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ferranmunoz](https://avatars.discourse-cdn.com/v4/letter/f/bbe5ce/32.png) [@ferranmunoz](https://discuss.elastic.co/u/ferranmunoz)\
**Post date:** [June 2, 2015, 9:00am UTC](https://discuss.elastic.co/t/using-function-score-in-kibana-4-search/1695/1 "2015-06-02T09:00:04Z")

</div>

I am trying to use function\_score in a Kibana 4 search. The query I am issuing is:

```
{"function_score":{"field_value_factor":{"field":"purchases","modifier":"log1p"}}}

```

I tried to write it in the query bar and also in the advanced query editor (Edit Saved Objects).

I get the following error:

![](https://sea2.discourse-cdn.com/elastic/uploads/default/original/1/c/1c9570d1b2074e1929e376c5518c8c0d1a75cef9.png)

The mapping of the field "purchases" is:

```
"purchases": { "type" : "long" }

```

What am I doing wrong?

---

<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:** [July 6, 2017, 2:18pm UTC](https://discuss.elastic.co/t/using-function-score-in-kibana-4-search/1695/2 "2017-07-06T14:18:43Z")

</div>