# Does ES store \_id field in Lucene as its docid?

**URL:** <https://discuss.elastic.co/t/does-es-store-id-field-in-lucene-as-its-docid/215977>\
**Category:** Elasticsearch\
**Created:** [January 22, 2020, 4:07am UTC](https://discuss.elastic.co/t/does-es-store-id-field-in-lucene-as-its-docid/215977 "2020-01-22T04:07:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![DeeeFOX](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/deeefox/32/49566_2.png) [@DeeeFOX](https://discuss.elastic.co/u/DeeeFOX)\
**Post date:** [January 22, 2020, 4:07am UTC](https://discuss.elastic.co/t/does-es-store-id-field-in-lucene-as-its-docid/215977/1 "2020-01-22T04:07:03Z")

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As the title asked,

Does ES store \_id field in Lucene as its docid?

Or

ES just store \_id field as an index-field and each time ES write a doc, lucene create an unique docid and return to ES?

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<div class="post-metadata">

**Author:** ![DeeeFOX](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/deeefox/32/49566_2.png) [@DeeeFOX](https://discuss.elastic.co/u/DeeeFOX)\
**Post date:** [January 22, 2020, 9:05am UTC](https://discuss.elastic.co/t/does-es-store-id-field-in-lucene-as-its-docid/215977/2 "2020-01-22T09:05:40Z")

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I'm still online and waiting for help...

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [January 22, 2020, 9:32am UTC](https://discuss.elastic.co/t/does-es-store-id-field-in-lucene-as-its-docid/215977/3 "2020-01-22T09:32:35Z")

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Please read the pinned post entitled [About the Elasticsearch category](https://discuss.elastic.co/t/about-the-elasticsearch-category/21), particularly the part starting "also be patient". It is not polite to bump your thread just a few hours after opening it as you just did.

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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:** [February 19, 2020, 9:32am UTC](https://discuss.elastic.co/t/does-es-store-id-field-in-lucene-as-its-docid/215977/4 "2020-02-19T09:32:44Z")

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