# Build aggregation on top of doc\_count of date histogram?
**URL:** https://discuss.elastic.co/t/build-aggregation-on-top-of-doc-count-of-date-histogram/132502
**Category:** Elasticsearch
**Created:** [May 18, 2018, 2:27pm UTC](https://discuss.elastic.co/t/build-aggregation-on-top-of-doc-count-of-date-histogram/132502 "2018-05-18T14:27:16Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Alexander\_Sviridov](https://discuss.elastic.co/u/Alexander_Sviridov)
#### Post date: [May 18, 2018, 2:27pm UTC](https://discuss.elastic.co/t/build-aggregation-on-top-of-doc-count-of-date-histogram/132502/1 "2018-05-18T14:27:16Z")
Hello!
I want to implement Control Chart as it described here: [https://www.elastic.co/blog/staying-in-control-with-moving-averages-part-2](https://www.elastic.co/blog/staying-in-control-with-moving-averages-part-2), but I do not have metrics — I have events with timestamps.
So my idea was to make the date histogram, and then use resulting doc\_count as source for moving averages as described in a blog post. But I cannot figure out how to do it.
Is it possible? Thank you!
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 15, 2018, 2:27pm UTC](https://discuss.elastic.co/t/build-aggregation-on-top-of-doc-count-of-date-histogram/132502/2 "2018-06-15T14:27:22Z")
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