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d2461643cd
When an ML job cannot be allocated to a node the exception contained an explanation of why the job couldn't be allocated to each node in the cluster. For large clusters this was not particularly easy to read and made the error displayed in the UI look very scary. This commit changes the structure of the error to an outer ElasticsearchException with a high level message and an inner IllegalStateException containing the detailed explanation. Because the definition of root cause is the innermost ElasticsearchException the detailed explanation will not be the root cause (which is what Kibana displays). Fixes #29950