# Replacing \_id field

**URL:** <https://discuss.elastic.co/t/replacing-id-field/290167>\
**Category:** Logstash\
**Created:** [November 25, 2021, 11:03am UTC](https://discuss.elastic.co/t/replacing-id-field/290167 "2021-11-25T11:03:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mangeshs](https://avatars.discourse-cdn.com/v4/letter/m/e36b37/32.png) [@mangeshs](https://discuss.elastic.co/u/mangeshs)\
**Post date:** [November 25, 2021, 11:03am UTC](https://discuss.elastic.co/t/replacing-id-field/290167/1 "2021-11-25T11:03:50Z")

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there is \_id field auto generated by Elasticsearch which differ the each doc  
So I have an unique field to set as \_id field  
I want to that field as \_id for doc in Logstash conf  
How do to that

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**Author:** ![leandrojmp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/leandrojmp/32/107231_2.png) [@leandrojmp](https://discuss.elastic.co/u/leandrojmp)\
**Post date:** [November 25, 2021, 12:44pm UTC](https://discuss.elastic.co/t/replacing-id-field/290167/2 "2021-11-25T12:44:01Z")

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You shoud use the `document_id` option as described in the [documentation](https://www.elastic.co/guide/en/logstash/current/plugins-outputs-elasticsearch.html#plugins-outputs-elasticsearch-document_id).

Use the following option in your Elasticsearch output:

```auto
document_id => "%{[your_id_field]}"

```

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<div class="post-metadata">

**Author:** ![mangeshs](https://avatars.discourse-cdn.com/v4/letter/m/e36b37/32.png) [@mangeshs](https://discuss.elastic.co/u/mangeshs)\
**Post date:** [November 25, 2021, 1:10pm UTC](https://discuss.elastic.co/t/replacing-id-field/290167/3 "2021-11-25T13:10:39Z")

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Yes I did the same thing after searching the documentations  
I got know one new things that field should be lowercase  
document\_id =\> "%{api\_request\_id}"

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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:** [December 23, 2021, 1:11pm UTC](https://discuss.elastic.co/t/replacing-id-field/290167/4 "2021-12-23T13:11:38Z")

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