# Reindexing error

**URL:** <https://discuss.elastic.co/t/reindexing-error/265736>\
**Category:** Elasticsearch\
**Tags:** reindex\
**Created:** [February 28, 2021, 10:38pm UTC](https://discuss.elastic.co/t/reindexing-error/265736 "2021-02-28T22:38:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![leemase004](https://avatars.discourse-cdn.com/v4/letter/l/fbc32d/32.png) [@leemase004](https://discuss.elastic.co/u/leemase004)\
**Post date:** [February 28, 2021, 10:38pm UTC](https://discuss.elastic.co/t/reindexing-error/265736/1 "2021-02-28T22:38:03Z")

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We are attempting to update the mappings for an index.  
The new mapping includes multiple aliases (around 36)

When we attempt to reindex the old indices to the new mappings we keep receiving this error:

Reindex can not write to a field alias.

Is there a work around? Is there a particular reason why this error populates?

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<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [February 28, 2021, 10:48pm UTC](https://discuss.elastic.co/t/reindexing-error/265736/2 "2021-02-28T22:48:13Z")

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Without understanding your mappings and your reindex request, it's hard to say.

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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:** [March 28, 2021, 10:48pm UTC](https://discuss.elastic.co/t/reindexing-error/265736/3 "2021-03-28T22:48:25Z")

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