# During an upgrade from OpenSearch 2.19.2 to 3.0.0, we’re encountering compatibility errors with system indices

**URL:** <https://forum.opensearch.org/t/during-an-upgrade-from-opensearch-2-19-2-to-3-0-0-we-re-encountering-compatibility-errors-with-system-indices/25809>\
**Category:** Community\
**Tags:** community-meeting, proj-health-agenda\
**Created:** [July 16, 2025, 6:16pm UTC](https://forum.opensearch.org/t/during-an-upgrade-from-opensearch-2-19-2-to-3-0-0-we-re-encountering-compatibility-errors-with-system-indices/25809 "2025-07-16T18:16:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Nish](https://avatars.discourse-cdn.com/v4/letter/n/9dc877/32.png) [@Nish](https://forum.opensearch.org/u/Nish)\
**Post date:** [July 16, 2025, 6:16pm UTC](https://forum.opensearch.org/t/during-an-upgrade-from-opensearch-2-19-2-to-3-0-0-we-re-encountering-compatibility-errors-with-system-indices/25809/1 "2025-07-16T18:16:51Z")

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During an upgrade from OpenSearch 2.19.2 to 3.0.0, we’re encountering compatibility errors with system indicesRunning OpenSearch Post-Installation Script  
Restarting OpenSearch.service after upgrade  
Job for OpenSearch.service failed because the control process exited with an error code.  
See “systemctl status opensearch.service” and “journalctl -xeu opensearch.service” for details.  
dpkg: error processing package opensearch (–configure):  
Installed opensearch package post-installation script subprocess returned error exit status 1  
Processing triggers for libc-bin (2.36-9+deb12u10) …  
Errors were encountered while processing:  
opensearch  
E: Sub-process /usr/bin/dpkg returned an error code (1)Purchases & Account Services temporarily unavailable

We’re currently upgrading our systems. Log-in and transactions are temporarily down but feel free to browse and explore our site. We’ll be back shortly. Thanks for your patience!

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**Author:** ![cwperks](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/cwperks/32/4968_2.png) [@cwperks](https://forum.opensearch.org/u/cwperks)\
**Post date:** [July 19, 2025, 2:46am UTC](https://forum.opensearch.org/t/during-an-upgrade-from-opensearch-2-19-2-to-3-0-0-we-re-encountering-compatibility-errors-with-system-indices/25809/2 "2025-07-19T02:46:50Z")

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Hi Nish,

Could you provide any more info about the issue? Particularly application logs that may point to an exception.

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**Author:** ![pablo](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/pablo/32/10363_2.png) [@pablo](https://forum.opensearch.org/u/pablo)\
**Post date:** [July 21, 2025, 7:14pm UTC](https://forum.opensearch.org/t/during-an-upgrade-from-opensearch-2-19-2-to-3-0-0-we-re-encountering-compatibility-errors-with-system-indices/25809/3 "2025-07-21T19:14:18Z")

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@Nish Additional questions to @cwperks ones. How did you deploy the cluster and what OS and version was used?