Best way to store reference values

Hi all,
I have a Python script doing continuous checks over some data in elastic.
I use the last_check time to establish the next checking, I need in some way to always store the last check timestamp.

My question is: Which is the best and elegant way to store this values? Use an index for this "settings" with a single document which will be updated every time a last check is performed?
or having multiples documents and always ask by the last value?

Any suggestion is welcome

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