Getting values for default settings

Hello

Is there a way to get value of default settings that are used by ES?
For example index refresh duration. default is 1s, but when I query the /_settings endpoint, it won't give that information if its not set. I would like to see all the settings for an index.*

Similarly for other default cluster, node settings.

regards
Gopal

Not currently possible, see https://github.com/elastic/elasticsearch/issues/10713