How to confirm index store type

The documentation says the default store is niofs for Linux. But I did a
test (0.19.12). Everything is identical except in one index I explicitly
set store type to niofs. The index w/ the explicit niofs store type
performs slightly better (30ms vs 20ms). My question is is there a way to
confirm that the index w/o the explicit store type setting is indeed niofs?


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