# Elastic reindex documents with new fields

**URL:** <https://discuss.elastic.co/t/elastic-reindex-documents-with-new-fields/315177>\
**Category:** Elasticsearch\
**Created:** [September 26, 2022, 2:00pm UTC](https://discuss.elastic.co/t/elastic-reindex-documents-with-new-fields/315177 "2022-09-26T14:00:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vee](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vee/32/55759_2.png) [@vee](https://discuss.elastic.co/u/vee)\
**Post date:** [September 26, 2022, 2:00pm UTC](https://discuss.elastic.co/t/elastic-reindex-documents-with-new-fields/315177/1 "2022-09-26T14:00:57Z")

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Hi - What's the best way to update an existing index with new field added to it? For eg:

Current index has fields, firstName,lastName,streetNo,City,Zipcode.

I would like to add one more field called FullAddress - which is a concatenation of streetNo,City,ZipCode.

Reindex will not allow to use same index as destination, as I need to update all existing documents as well in the index.

Thanks.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [October 24, 2022, 2:01pm UTC](https://discuss.elastic.co/t/elastic-reindex-documents-with-new-fields/315177/2 "2022-10-24T14:01:29Z")

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