Inherit ServerError from Transport::Error instead of StandardError #100
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Currently there is an error in the documentation:
This is not true, because
Transport::ServerErrorinherits from StandardError. If yourescue Elasticsearch::Transport::Transport::Error, you would actually miss all exceptions such asNotFoundorServiceUnavailable.Behavior is now in line with documentation.
Added test may be ditched, it's a very trivial change and testing the exception hierarchy chain doesn't make much sense.