# Add new field in existing index and template

**URL:** <https://discuss.elastic.co/t/add-new-field-in-existing-index-and-template/270679>\
**Category:** Elasticsearch\
**Created:** [April 20, 2021, 9:28am UTC](https://discuss.elastic.co/t/add-new-field-in-existing-index-and-template/270679 "2021-04-20T09:28:45Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [April 20, 2021, 9:40am UTC](https://discuss.elastic.co/t/add-new-field-in-existing-index-and-template/270679/2 "2021-04-20T09:40:45Z")

</div>

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> [@niraj\_pandey](#):
>
> I want this changes on existing index

You can't. I mean that you can add the new field but you will have to reindex the data as the new field will be empty. Or you can use the new runtime fields feature to compute it on the fly if it's computed from the existing data. See

> **[Introducing Elasticsearch runtime fields](https://www.elastic.co/blog/introducing-elasticsearch-runtime-fields)**
>
> In 7.11, we’re excited to announce schema on read in the Elastic Stack. We now offer the best of both worlds on a single platform. Schema on read for flexibility and schema on write for performance. We call our implementation runtime fields.

> [@niraj\_pandey](#):
>
> and for all future indexes which I create on monthly basis

Just update the template with the new field.

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_[View the full topic](https://discuss.elastic.co/t/add-new-field-in-existing-index-and-template/270679)._