-- | The stack's new host name theme, with spaces are replaced by underscores. The
-- theme is used to generate host names for the stack's instances. By default, 'HostnameTheme' is set to 'Layer_Dependent', which creates host names by appending integers to
-- the layer's short name. The other themes are:
--
-- 'Baked_Goods'   'Clouds'   'Europe_Cities'   'Fruits'   'Greek_Deities'   'Legendary_creatures_from_Japan'   'Planets_and_Moons'   'Roman_Deities'   'Scottish_Islands'   'US_Cities'   'Wild_Cats'   To obtain a generated host name, call 'GetHostNameSuggestion', which returns
-- a host name based on the current theme.
usHostnameTheme :: Lens' UpdateStack (Maybe Text)
usHostnameTheme = lens _usHostnameTheme (\s a -> s { _usHostnameTheme = a })
usHostnameTheme :: Lens' UpdateStack (Maybe Text)
usHostnameTheme = lens _usHostnameTheme (\s a -> s { _usHostnameTheme = a })
usHostnameTheme = lens _usHostnameTheme (\s a -> s { _usHostnameTheme = a })