Is this just the opensearch that's serving production, or was the one in 
Toolforge also updated?

> On May 5, 2026, at 11:22 AM, Peter Fischer via Cloud-announce via Cloud 
> <[email protected]> wrote:
> 
> Hello everyone,
> 
> As part of the ongoing upgrade of our Search infrastructure from OpenSearch 
> 1.3 → 2.19 → 3.5, we recently upgraded the first production cluster 
> (cloudelastic).
> 
> Following the upgrade, the cluster has become unstable. In particular, some 
> indices have entered a read-only (red) state, which may impact search 
> functionality relying on this cluster.
> 
> We are currently investigating the issue from multiple angles. Early 
> indications suggest this may be related to readahead settings in combination 
> with the underlying storage hardware, but this is not yet confirmed.
> 
> Tracking task: https://phabricator.wikimedia.org/T424852
> 
> Our current focus is on stabilizing the cluster and restoring full 
> functionality. We will share updates as we learn more. At this point, we 
> expect to have the cluster stabilized again by the end of the week.
> 
> If you are observing issues that you suspect are related, please add details 
> to the Phabricator task or reach out to the Search team.
> 
> Thanks for your patience,
> Peter
> 
> --
> Peter Fischer (he/him)
> Senior Software Engineer, Search Platform
> Wikimedia Foundation
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