ILM and Full Text Search

Hello,

I'm looking into various ILM products such as those from Kazeon, EMC,
NeoPath, etc. One question that comes up is how these products behave
when a client does a full-text search against a volume that contains
data that's been migrated away.

From what I understand, a file access causes many of these products to
bring the file back from a secondary tier. I know that some ILM API's
allow for redirection, which would seemingly avoid this issue.
However, others do not have redirection. Wouldn't this mean that a
full-text search causes the entire set of data to be brought back onto
the primary tier? Doesn't this cause capacity issues?

What am I missing? Your help is greatly appreciated.

Thanks,
Ron