How to see all current parameters setting running?

Hi,
Is there any query that I can run to see all the parameters setting, other
than referring to elasticsearch.yml, which might be overwritten via
comman/API?

for e.g.:

action.destructive_requires_name
discovery.zen.minimum_master_nodes
....

I have tried to run curl -XGET "localhost:9200/_settings", but it is not
showing all the parameters.

Thanks.

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