# File lib/fog/aws/requests/compute/modify_instance_attribute.rb, line 24
        def modify_instance_attribute(instance_id, attributes)
          params = {}
          params.merge!(Fog::AWS.indexed_param('GroupId', attributes.delete('GroupId') || []))
          params.merge!(attributes)
          request({
            'Action'        => 'ModifyInstanceAttribute',
            'InstanceId'    => instance_id,
            :idempotent     => true,
            :parser         => Fog::Parsers::Compute::AWS::Basic.new
          }.merge!(params))
        end