# Is combined\_script required or not in scripted\_metric? **URL:** \ **Category:** Elasticsearch\ **Created:** [July 13, 2022, 7:54am UTC](https://discuss.elastic.co/t/is-combined-script-required-or-not-in-scripted-metric/309502 "2022-07-13T07:54:54Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![angelo\_c](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/angelo_c/32/108238_2.png) [@angelo\_c](https://discuss.elastic.co/u/angelo_c)\ **Post date:** [July 13, 2022, 7:54am UTC](https://discuss.elastic.co/t/is-combined-script-required-or-not-in-scripted-metric/309502/1 "2022-07-13T07:54:54Z")
Hi there, I was reading the documentation for scripted\_metric aggregation [here](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-scripted-metric-aggregation.html), but I feel it is a bit confusing. I report what written there: **map\_script** Executed once per document collected. This is a required script. **If no combine\_script is specified** , the resulting state needs to be stored in the `state` object... **combine\_script** Executed once on each shard after document collection is complete. **This is a required script**. How can it be that in one way the combine\_script can be omitted, while later the doc says that it is required? Is combined\_script maybe required only if the index is configured to use multiple shards? BR, /A ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [August 10, 2022, 7:55am UTC](https://discuss.elastic.co/t/is-combined-script-required-or-not-in-scripted-metric/309502/2 "2022-08-10T07:55:29Z")
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