# Each Elasticsearch Shard is a Lucene Index

**URL:** <https://discuss.elastic.co/t/each-elasticsearch-shard-is-a-lucene-index/185206>\
**Category:** Elasticsearch\
**Created:** [June 11, 2019, 1:55pm UTC](https://discuss.elastic.co/t/each-elasticsearch-shard-is-a-lucene-index/185206 "2019-06-11T13:55:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![saravananselvamohan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/saravananselvamohan/32/47407_2.png) [@saravananselvamohan](https://discuss.elastic.co/u/saravananselvamohan)\
**Post date:** [June 11, 2019, 1:55pm UTC](https://discuss.elastic.co/t/each-elasticsearch-shard-is-a-lucene-index/185206/1 "2019-06-11T13:55:26Z")

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![Lucene%20Index](https://us1.discourse-cdn.com/elastic/original/3X/9/f/9f88c3428463e1582a913987472c8d4a04f02758.png)

I am not understanding the line "Each Elasticsearch Shard is a Lucene Index"

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [June 11, 2019, 2:40pm UTC](https://discuss.elastic.co/t/each-elasticsearch-shard-is-a-lucene-index/185206/2 "2019-06-11T14:40:34Z")

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Elasticsearch uses Lucene behind the scene.  
Elasticsearch splits indices into shards.  
Each shard is a complete index engine powered by Lucene.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 9, 2019, 2:40pm UTC](https://discuss.elastic.co/t/each-elasticsearch-shard-is-a-lucene-index/185206/3 "2019-07-09T14:40:42Z")

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