Index alias

[iamtheschmitzer (Jeff Schmitz)]

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?

Thanks

[elasticforme (Sachin)]

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)