[7.5] Handle unexpected/unchecked exceptions correctly (#49080) #49138
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Ensures that methods that are called from different threads ( i.e. from the callbacks of org.apache.http.concurrent.FutureCallback ) catch `Exception` instead of only the expected checked exceptions. This resolves a bug where OpenIdConnectAuthenticator#mergeObjects would throw an IllegalStateException that was never caught causing the thread to hang and the listener to never be called. This would in turn cause Kibana requests to authenticate with OpenID Connect to timeout and fail without even logging anything relevant. This also guards against unexpected Exceptions that might be thrown by invoked library methods while performing the necessary operations in these callbacks.
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Backports the following commits to 7.5: