[Transform] Retry when failing to start indexer #132048
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Bug: when the indexer state fails to save during a cluster state update, the Transform is stuck in STOPPING and cannot be restarted unless the user force stops to delete the task. Fix: the task will continuously retry starting the indexer until the cluster state update can succeed. Notes: - users can cancel the retry by force stopping the transform - the retry is displayed in the UI as "degraded" with a message as to why the transform is restarting - the transform now displays as STARTING rather than STOPPING until it successfully starts - the retry is audited so it displays in the Messages tab of the UI - the retry timer is randomly selected between 45s and 90s, this should help during rolling restarts for clusters that have a large amount of transforms Fix elastic#128221
prwhelan added >bug :ml/Transform 
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| Hi @prwhelan, I've created a changelog YAML for you. |
Collaborator
| Pinging @elastic/ml-core (Team:ML) |
jonathan-buttner approved these changes Aug 11, 2025
| params.getId(), | ||
| Strings.format( | ||
| "Failed while starting Transform. Automatically retrying every [%s] seconds. " | ||
| + "To cancel retries, force stop this transform. Failure: [%s]", |
Contributor
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What do you think about including the force stop command in the message here? Or is it expected that the user would do that via a UI button (I'm imagining it being done from the dev console)?
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Bug: when the indexer state fails to save during a cluster state update, the Transform is stuck in STOPPING and cannot be restarted unless the user force stops to delete the task.
Fix: the task will continuously retry starting the indexer until the cluster state update can succeed.
Notes:
Fix #128221