# How to do summary indexing in Elasticsearch
**URL:** https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491
**Category:** Elasticsearch
**Created:** [August 18, 2020, 8:42pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491 "2020-08-18T20:42:29Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@kelk](https://discuss.elastic.co/u/kelk)
#### Post date: [August 18, 2020, 8:42pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/1 "2020-08-18T20:42:29Z")
hi,
we have a massive index, few reference indexes and we wanted to summarise from these multiple indexes into a single "summary index" . This way we are planning to join the queries
So the questions
1. Can output of a GET/POST from elasticsearch be indexed into ElasticSearch (another index)?
2. Should it be sent to logstash again or is there a method to index without going outside elasticsearch?
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [August 18, 2020, 8:51pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/2 "2020-08-18T20:51:44Z")
Do you mean something like [https://www.elastic.co/guide/en/elasticsearch/reference/current/xpack-rollup.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/xpack-rollup.html)?
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### Author:  [@kelk](https://discuss.elastic.co/u/kelk)
#### Post date: [August 18, 2020, 9:33pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/3 "2020-08-18T21:33:13Z")
can the rollup join data from multiple indexes or do we need to individually roll them up?
I'm trying to achieve is a "correlation" of data within multiple indexes by putting into a single summarised index
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [August 18, 2020, 9:36pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/4 "2020-08-18T21:36:48Z")
Elasticsearch cannot join data.
What sort of correlation are you looking at?
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### Author:  [@kelk](https://discuss.elastic.co/u/kelk)
#### Post date: [August 18, 2020, 9:39pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/5 "2020-08-18T21:39:07Z")
I had a complex set of requirement whereby I've to aggregate and then alert based on a dynamic threshold (from a CSV file). So my thought was to put the Dynamic CSV && the summarised raw dataset into a single index and then alert from it.
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [August 18, 2020, 9:41pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/6 "2020-08-18T21:41:58Z")
Ah right, you might be able to use a chained input alert to do this - [https://www.elastic.co/guide/en/elasticsearch/reference/current/input-chain.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/input-chain.html)
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### Author:  [@kelk](https://discuss.elastic.co/u/kelk)
#### Post date: [August 18, 2020, 9:45pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/7 "2020-08-18T21:45:08Z")
very interesting. I will have a playaround with it. Meantime, I've upvoted. thanks again mate
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 15, 2020, 9:45pm UTC](https://discuss.elastic.co/t/how-to-do-summary-indexing-in-elasticsearch/245491/8 "2020-09-15T21:45:10Z")
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