First time I am installing the slapd with a mdb backend. Could this be because the syntax has changed? I am getting these messages: mdb_equality_candidates: (entryUUID) not indexed While I have in {2}mdb olcDbIndex entryUUID pres,eq CentOS Linux release 7.6.1810 (Core) openldap-clients-2.4.44-21.el7_6.x86_64 openldap-2.4.44-21.el7_6.x86_64 openldap-servers-2.4.44-21.el7_6.x86_64