def convert_hoptoad_keys_to_graylog2(hash)
      if hash['short_message'].to_s.empty?
        if hash.has_key?('error_class') && hash.has_key?('error_message')
          hash['short_message'] = hash.delete('error_class') + ': ' + hash.delete('error_message')
        end
      end
    end
def convert_hoptoad_keys_to_graylog2(hash)
      if hash['short_message'].to_s.empty?
        if hash.has_key?('error_class') && hash.has_key?('error_message')
          hash['short_message'] = hash.delete('error_class') + ': ' + hash.delete('error_message')
        end
      end
    end
Converts Hoptoad-specific keys in +@hash+ to Graylog2-specific.