https://bugs.openldap.org/show_bug.cgi?id=8618
--- Comment #27 from Quanah Gibson-Mount quanah@openldap.org --- (In reply to Quanah Gibson-Mount from comment #26)
Additionally, this was clearly documented in the UPGRADE section of the Admin guide.
Specifically, in the OpenLDAP 2.5 admin guide section on upgrading from OpenLDAP 2.4 or prior releases.