This bug is created as a clone of upstream ticket:
There is a configuration option nsslapd-idl-switch to choose "old" or "new" idl index code and format, but "old" does not work:
- the entryrdn index uses DB flags, which are not available if the db is opened in "old" mode.
- the switch is always reset to "new"
The old idl is for an internal performance analysis only.
No need to test the feature for the RHEL release.