Index alias

If I have a rollover index foo-000001, which rolls over to foo-N and alias index foo for them, is foo equivalent to the "latest" of those rollovers or the "union" of them?


alias always point to latest one. (in order to write to only one index)
index pattern point to union of all ( in order to see all data)

foo -> foo-000x (latest one which writes data on to foo-000x (index alias)

foo-* -> foo-* (and you use that to search all data) (index pattern)

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