# Does ES use a pure Apache Lucene?
**URL:** https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064
**Category:** Elasticsearch
**Created:** [December 17, 2018, 2:52am UTC](https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064 "2018-12-17T02:52:25Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@0ctopus13prime](https://discuss.elastic.co/u/0ctopus13prime)
#### Post date: [December 17, 2018, 2:52am UTC](https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064/1 "2018-12-17T02:52:26Z")
Does ES use a pure Apache Lucene without any customizations?
I plan to run ES on the top of the customized Lucene (Method signitures remain, some magic numbers will be touched)
I wondering if Elasticsearch is able to run on that modified version of Lucene
Thanks for your answers in advance!
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [December 17, 2018, 6:46am UTC](https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064/2 "2018-12-17T06:46:12Z")
What are you looking to achieve?
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### Author:  [@0ctopus13prime](https://discuss.elastic.co/u/0ctopus13prime)
#### Post date: [December 26, 2018, 2:16am UTC](https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064/3 "2018-12-26T02:16:57Z")
As I said, I'm trying to modify a little bit inside Lucene and make ES run with it.
For example implementing native (Ex BulkOperation) and linking it with JNI
And some magic numbers (Buffer size, etc)
So the purpose of this trial is to make Lucene more fit for our use case.
In order to achieve this I need to make sure ES is running on Pure Apache Lucene so that I can switch customized version of Lucene silently
Thank you
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### Author:  [@xeraa](https://discuss.elastic.co/u/xeraa)
#### Post date: [December 26, 2018, 2:34am UTC](https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064/4 "2018-12-26T02:34:05Z")
Plain Lucene. [https://github.com/elastic/elasticsearch/blob/e9ef5bdce83f466b019a59f81186ecee0dd4bd29/server/build.gradle#L84-L99](https://github.com/elastic/elasticsearch/blob/e9ef5bdce83f466b019a59f81186ecee0dd4bd29/server/build.gradle#L84-L99) should be your starting point (though it might not be the only one).
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### Author:  [@0ctopus13prime](https://discuss.elastic.co/u/0ctopus13prime)
#### Post date: [December 26, 2018, 7:18am UTC](https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064/5 "2018-12-26T07:18:59Z")
Thank you for the answer!
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 23, 2019, 7:19am UTC](https://discuss.elastic.co/t/does-es-use-a-pure-apache-lucene/161064/6 "2019-01-23T07:19:09Z")
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