[8.13] [Transform] Fail checkpoint on missing clusters (#106793) #106842
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When there are no remote or local clusters for a given source index, we call the listener's `onFailure` method with a `CheckpointException`. A running transform will fail and retry, eventually moving into an unhealthy and failed state. Any call to the stats API will note the checkpoint failure and return. This fixes a timeout issue calling the Transform stats API and prevents the Transform from being stuck in indexing. Fix elastic#106790 Fix elastic#104533
prwhelan
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:ml/Transform
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Backports the following commits to 8.13: