I don't think there has ever been a promise of rollback to previous minor 
version without reindexing? If so, where is that promise documented?

Jan

> 3. aug. 2021 kl. 21:06 skrev Evgeny Ivanskiy 
> <eivans...@salesforce.com.INVALID>:
> 
> Hi,
> We upgrading SOLR from 8.6.3 to 8.8.2
> Everything works fine except rollback testing
> When we do rollback, the indexes do not open due to the missing of the
> codec. 8.6.3 cannot open indexes builded on 8.8.2
> Of course we can reindex all the data, but it takes hours. Is there any
> better approach to rollback to the previous version?

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