https://bugs.openldap.org/show_bug.cgi?id=9858
--- Comment #12 from Howard Chu hyc@openldap.org --- I didn't ask for '-p' on the ixck dump.
Anyway, the ixck DB should be empty. The fact that it's not means that it had unfinished background indexing tasks, which it tried to run on the next startup. That explains why the online index task is being run.