Yes, indeed this is our case. I had to manually slapindex, then only
the correct result (even though we have specified the attribute to index
automatically in slapd.conf).
How do you specify automatic attribute indexing in slapd.conf? I didn't
know about that.
However, do we have to slapindex nightly since this is a case, or is
bug (we're using openldap 2.4.19)?
Apparently, you ran slapindex without even reading the man page. It
*must* be run when you change indexes in slapd.conf, and only in that
case. And slapd *must not* be running when you run slapindex (it
complains and refuses to start, otherwise, as far as I know).
Or, if you modify indexes using ldapmodify in cn=config, re-indexing will
be automatical, no need to run slapindex. Is this what you meant?