[7.17] [ML] ML stats failures should not stop the usage API working #91936
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It is possible to meddle with internal ML state such that calls to the ML stats APIs return errors. It is justifiable for these single purpose APIs to return errors when the internal state of ML is corrupted. However, it is undesirable for these low level problems to completely prevent the overall usage API from returning, because then callers cannot find out usage information from any part of the system. This change makes errors in the ML stats APIs non-fatal to the overall response of the usage API. When an ML stats APIs returns an error, the corresponding section of the ML usage information will be blank. Backport of elastic#91917
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It is possible to meddle with internal ML state such that calls to the ML stats APIs return errors. It is justifiable for these single purpose APIs to return errors when the internal state of ML is corrupted. However, it is undesirable for these low level problems to completely prevent the overall usage API from returning, because then callers cannot find out usage information from any part of the system.
This change makes errors in the ML stats APIs non-fatal to the overall response of the usage API. When an ML stats APIs returns an error, the corresponding section of the ML usage information will be blank.
Backport of #91917