my $input_hash_ref={

	key1 => {
		some_field=>'value1',
		key=>'key1',
		alt_key=>'alt_key1'
	},
	
	key2 => {
		some_field=>'value2',
		key=>'key2',
		alt_key=>'alt_key2'
	}
	
};

my $output_hash_ref={

	alt_key1 => {
		some_field=>'value1',
		key=>'key1',
		alt_key=>'alt_key1'
	},
	
	alt_key2 => {
		some_field=>'value2',
		key=>'key2',
		alt_key=>'alt_key2'
	}
	
};