# Elastic search percolator scalability issues
**URL:** https://discuss.elastic.co/t/elastic-search-percolator-scalability-issues/164776
**Category:** Elasticsearch
**Created:** [January 18, 2019, 10:56am UTC](https://discuss.elastic.co/t/elastic-search-percolator-scalability-issues/164776 "2019-01-18T10:56:14Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Bibin\_Sebastian](https://discuss.elastic.co/u/Bibin_Sebastian)
#### Post date: [January 18, 2019, 10:56am UTC](https://discuss.elastic.co/t/elastic-search-percolator-scalability-issues/164776/1 "2019-01-18T10:56:14Z")
I am running a 4 data node + 2 master node cluster and have created an index to store search queries. In the percolator I store regexp based search queries.
When I run a percolate search passing a document, I see the latency of search/match being very high (~500ms). I have only stored very few (\<10) search queries in percolator index but the search latency seems to be at very unacceptable levels.
any thoughts on this?
My index mappings is given below
{"settings":{"number\_of\_shards":5,"number\_of\_replicas":1},
"mappings":{"\_doc":{"properties":{"createTime":{"type":"long"},"query":{"type":"percolator"},"user":{"type":"nested","dynamic":"true","properties":{"id":{"type":"text","fields":{"keyword":{"type":"keyword","ignore\_above":256}}}}},"key":{"type":"keyword"}}}}}
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### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 18, 2019, 11:16am UTC](https://discuss.elastic.co/t/elastic-search-percolator-scalability-issues/164776/2 "2019-01-18T11:16:41Z")
> I store regexp based search queries
I believe that this is the main cause. Regexp queries are slow.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 15, 2019, 11:16am UTC](https://discuss.elastic.co/t/elastic-search-percolator-scalability-issues/164776/3 "2019-02-15T11:16:49Z")
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