https://bugs.openldap.org/show_bug.cgi?id=9694
--- Comment #3 from dpa-openldap@aegee.org dpa-openldap@aegee.org --- slapd-config(5):olcSyncrepl says: The syncdata parameter must be set to either "accesslog" if the log conforms to the slapo-accesslog(5) log format, or "changelog" if the log conforms to the obsolete changelog format.
So “changelog” is obsolete format. The Guide uses the term changelog, without stating, that it is obsolete.