How to get a specific ES setting?

Is there a way to get from ES the value of a specific setting? For instance, imagine that we want to know the value of index.translog.flush_threshold_period so to know whether it has been changed manually or it has its default value.
I'm talking about something like that:

I've read these similar questions (here and here) but as far as I understood them the OPs wanted to get the full list of settings the node or cluster is using. On my part, I'd like to get a particular setting.

Thanks in advance.

EDIT: It will appear in the output of http://mynode:9200/_all/_settings when set as different from its default value. However, is it possible to get this value alone?

No there isn't unfortunately. Please do raise something against GH though as it sounds like a good one!

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