Specify multiple nsMatchingRule values for an index: nsMatchingRule: value ... nsMatchingRule: valueN Some of the values will be silently lost if the total length of the string of values exceeds 1024 bytes. There should be no limit.
Upstream ticket: https://fedorahosted.org/389/ticket/55
Fixed in 389-ds-base-1.2.10.rc1 now in Fedora/EPEL Testing