# ES upgraded to 6.2 but didn't reindex indices first

**URL:** https://discuss.elastic.co/t/es-upgraded-to-6-2-but-didnt-reindex-indices-first/122633
**Category:** Elasticsearch
**Created:** [March 6, 2018, 4:09am UTC](https://discuss.elastic.co/t/es-upgraded-to-6-2-but-didnt-reindex-indices-first/122633 "2018-03-06T04:09:20Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![jamesl](https://avatars.discourse-cdn.com/v4/letter/j/c0e974/32.png) [@jamesl](https://discuss.elastic.co/u/jamesl)
#### Post date: [March 6, 2018, 4:09am UTC](https://discuss.elastic.co/t/es-upgraded-to-6-2-but-didnt-reindex-indices-first/122633/1 "2018-03-06T04:09:20Z")

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Hi. I just upgraded my ES from 5.6.3 --\> 6.2. I missed the step to reindex all my indices first (they were done when the cluster was 2.3.x) Is there anyway I can reindex them now without having to roll back some of my master and data nodes back to 5.6.3?

Error message I'm getting.

[2018-03-06T15:36:46,422][ERROR][o.e.b.Bootstrap] Exceptionjava.lang.IllegalStateException: The index [[indices-2017.09.07/BGtlW\_i4SGO6CzaHEbz\_OQ]] was created with version [2.3.4] but the minimum compatible version is [5.0.0]. It should be re-indexed in Elasticsearch 5.x before upgrading to 6.2.2.

thanks.

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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: [April 3, 2018, 4:09am UTC](https://discuss.elastic.co/t/es-upgraded-to-6-2-but-didnt-reindex-indices-first/122633/2 "2018-04-03T04:09:41Z")

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