# ElasticSearch doesn't start after upgrade from 2.3.1 to 5.6.4
**URL:** https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371
**Category:** Elasticsearch
**Created:** [November 13, 2017, 11:01am UTC](https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371 "2017-11-13T11:01:02Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@tomsk](https://discuss.elastic.co/u/tomsk)
#### Post date: [November 13, 2017, 11:01am UTC](https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371/1 "2017-11-13T11:01:02Z")
Hello,
I was running on elasticsearch 2.3.1, but I had to upgrade to 5.6.4 (because of kibana), but Elasticsearch won't start anymore.
This is **log** from Elasticsearch:
> java.lang.IllegalStateException: The index [[cyclone3.mysite\_sk/Qf5ccdWNRYKFGs4lBffSAQ]] was created with version [1.2.1] but the minimum compatible version is [2.0.0-beta1]. It should be re-indexed in Elasticsearch 2.x before upgrading to 5.6.4.
And lot of the same errors.
Yes I understand that I need to reindex, but how? And does I lose all data?
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### Author:  [@Leandro\_Sampaio](https://discuss.elastic.co/u/Leandro_Sampaio)
#### Post date: [November 13, 2017, 12:31pm UTC](https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371/2 "2017-11-13T12:31:35Z")
Why did you made a upgrade... In my case I put 2 ES running in sametime and run a shellscript to export manually data between ES.
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### Author:  [@tomsk](https://discuss.elastic.co/u/tomsk)
#### Post date: [November 13, 2017, 12:40pm UTC](https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371/3 "2017-11-13T12:40:42Z")
Because I wanted to install Kibana/Sense
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### Author:  [@Leandro\_Sampaio](https://discuss.elastic.co/u/Leandro_Sampaio)
#### Post date: [November 13, 2017, 1:12pm UTC](https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371/4 "2017-11-13T13:12:59Z")
Could you do the rollback?
If yes, you can go up with the 2 environments in parallel ... then you migrate the content via REST call.
Upgrading is tricky unless you perform all the tests in a separate environment.
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### Author:  [@tomsk](https://discuss.elastic.co/u/tomsk)
#### Post date: [November 13, 2017, 1:59pm UTC](https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371/5 "2017-11-13T13:59:33Z")
How can I rollback?
And how to set up 2 enviroments in parallel? And how to migrate the content?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 11, 2017, 1:59pm UTC](https://discuss.elastic.co/t/elasticsearch-doesnt-start-after-upgrade-from-2-3-1-to-5-6-4/107371/6 "2017-12-11T13:59:34Z")
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