# Perform a pipelines aggregation over the full set of potential buckets
**URL:** https://discuss.elastic.co/t/perform-a-pipelines-aggregation-over-the-full-set-of-potential-buckets/287097
**Category:** Elasticsearch
**Created:** [October 19, 2021, 1:38pm UTC](https://discuss.elastic.co/t/perform-a-pipelines-aggregation-over-the-full-set-of-potential-buckets/287097 "2021-10-19T13:38:58Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@seanletendre](https://discuss.elastic.co/u/seanletendre)
#### Post date: [October 19, 2021, 1:38pm UTC](https://discuss.elastic.co/t/perform-a-pipelines-aggregation-over-the-full-set-of-potential-buckets/287097/1 "2021-10-19T13:38:58Z")
When using the `_search` API of Elasticsearch, if you set size to 10, and perform an `avg` metric aggregation, the average will be of all values across the dataset matching the query, not just the average of the 10 items returned in the `hits` array.
On the other hand, if you perform a `terms` aggregation and set the `size` of the `terms` aggregation to be 10, then performing an `avg_buckets` aggregation on those `terms` buckets will calculate an average over only those 10 buckets - not all potential buckets.
How can I calculate the an average of some field across all potential buckets, but still only have 10 items in the `buckets` array?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 16, 2021, 1:39pm UTC](https://discuss.elastic.co/t/perform-a-pipelines-aggregation-over-the-full-set-of-potential-buckets/287097/2 "2021-11-16T13:39:44Z")
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