# Elastic Search performance degraded after veriosn update from ES 1.4.2 to ES 7.9
**URL:** https://discuss.elastic.co/t/elastic-search-performance-degraded-after-veriosn-update-from-es-1-4-2-to-es-7-9/251367
**Category:** Elasticsearch
**Created:** [October 8, 2020, 4:23am UTC](https://discuss.elastic.co/t/elastic-search-performance-degraded-after-veriosn-update-from-es-1-4-2-to-es-7-9/251367 "2020-10-08T04:23:20Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@GauriA](https://discuss.elastic.co/u/GauriA)
#### Post date: [October 8, 2020, 4:23am UTC](https://discuss.elastic.co/t/elastic-search-performance-degraded-after-veriosn-update-from-es-1-4-2-to-es-7-9/251367/1 "2020-10-08T04:23:20Z")
We want to upgrade the OLD ES 1.4.2 setup to new ES 7.9. For that we are testing the search performance. I am testing the search performance by querying the search queries returning different no. of documents simultaneously by 5 different clients(REST API).I am using scroll API to get the results by calling it one after other to get all the matching results. I am just iterating through the results before making next scroll request. Some queries returning very large data, some returns medium data. There is a query which returns 90% of documents of the index. This scroll API query takes 2 hrs to complete in ES 1.4.2 and same query takes about 11 hrs to complete in ES 7.9. I was expecting performance increase after upgrading to ES 7.9 but found huge performance degradation. Anyone knows the reason behind this?. All the default settings I m using for both the ES versions. Please provide help here. Thanks
Sample Query : #Query 1 : [http://localhost:9200/cgh\_hs\_hg19\_20170821/\_search?scroll=1m](http://localhost:9200/cgh_hs_hg19_20170821/_search?scroll=1m)
```auto
{
"size": 1000,
"query" : {
"match_phrase" : {
"num_hits" : "1"
}
}
}
```
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 5, 2020, 4:23am UTC](https://discuss.elastic.co/t/elastic-search-performance-degraded-after-veriosn-update-from-es-1-4-2-to-es-7-9/251367/2 "2020-11-05T04:23:29Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.