Terms Filter lookup with realtime?

Hi All,

is it possible to use terms filter filter lookup mechanism,
so that changes to the lookup document are used in realtime.

for example i want to filter "already seen documents" out and have
a lookup document that contains already seen document ids which is updated
as the tracking system reports (streaming)
that the document was viewed by a certain user.

will i be able to use terms lookup for this or does terms lookup depend on
the index refresh?

and is this a good idea performancewise?

THA
-A

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