# Adding new field to existing document

**URL:** https://discuss.elastic.co/t/adding-new-field-to-existing-document/212671
**Category:** Logstash
**Created:** [December 20, 2019, 1:58pm UTC](https://discuss.elastic.co/t/adding-new-field-to-existing-document/212671 "2019-12-20T13:58:34Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![elasticforme](https://avatars.discourse-cdn.com/v4/letter/e/f05b48/32.png) [@elasticforme](https://discuss.elastic.co/u/elasticforme)
#### Post date: [December 20, 2019, 1:58pm UTC](https://discuss.elastic.co/t/adding-new-field-to-existing-document/212671/1 "2019-12-20T13:58:34Z")

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Can I use logstash to read elasticsearch index create new field and write same document back to same index?

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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: [January 17, 2020, 2:09pm UTC](https://discuss.elastic.co/t/adding-new-field-to-existing-document/212671/2 "2020-01-17T14:09:13Z")

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