[7.x] [ML] Ignore exceptions while opening job after SIGTERM to JVM (#75850) #75872
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…c#75850) * [ML] Ignore exceptions while opening job after SIGTERM to JVM We observed that some jobs failed during a rolling upgrade in Elastic Cloud. This happened because steps of the job open sequence failed with exceptions after core Elasticsearch services shut down in response to the SIGTERM. This change makes the persistent task executor for anomaly detection jobs ignore exceptions received after the JVM has received a shutdown signal, for example a SIGTERM. By doing nothing in response to such exceptions the persistent task remains in cluster state and will get assigned to a different node after the current node leaves the cluster. * Address review comment
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Backports the following commits to 7.x: