How can I check index storage type by CURL?

My system had some issues with the index storage type.
Couldn't find which type it was, but by changing the setting at the elasticsearch.yml it seemed to be mmapfs. (Actually we had a big problem of using too much memory)

The issue was solved after changing the setting to niofs.

I have several other systems, and I want to know a way to check if the elasticsearch was on mmapfs or niofs by CURL.(We didn't set the before so it would been working as the default value)

Is there anyway to check by setting value by CURL or is the setting not able to check by CURL.

My systems are all elasticsearch 5.5.1

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