# JSON Input for Unique Count Metrics

**URL:** <https://discuss.elastic.co/t/json-input-for-unique-count-metrics/207314>\
**Category:** Kibana\
**Created:** [November 11, 2019, 9:31am UTC](https://discuss.elastic.co/t/json-input-for-unique-count-metrics/207314 "2019-11-11T09:31:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Atul\_Gunjal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/atul_gunjal/32/57232_2.png) [@Atul\_Gunjal](https://discuss.elastic.co/u/Atul_Gunjal)\
**Post date:** [November 11, 2019, 9:31am UTC](https://discuss.elastic.co/t/json-input-for-unique-count-metrics/207314/1 "2019-11-11T09:31:30Z")

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I want to modify the value of count in JSON Input like that

 ![Capture](https://us1.discourse-cdn.com/elastic/original/3X/d/b/db31bba697b768d84ca0e4429ffed342a8dcca8d.png)  
but it dosn't work,however,it work for other Metric Aggregation,sum, min and so on.  
and I guess its not possible using Scripted Field for Unique Field.

It gives Internal Server Error

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**Author:** ![wylie](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/wylie/32/81794_2.png) [@wylie](https://discuss.elastic.co/u/wylie)\
**Post date:** [November 11, 2019, 3:50pm UTC](https://discuss.elastic.co/t/json-input-for-unique-count-metrics/207314/2 "2019-11-11T15:50:42Z")

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There are examples of using a scripted value for the Cardinality function here: [https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-cardinality-aggregation.html#\_script\_3](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-cardinality-aggregation.html#_script_3)

Specifically, you probably need to specify `doc['_value']` as the field name in your script.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 9, 2019, 3:50pm UTC](https://discuss.elastic.co/t/json-input-for-unique-count-metrics/207314/3 "2019-12-09T15:50:45Z")

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