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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/47831

Steps to reproduce:

[1]  Setup a DS instance
[2]  Configure the objectclass index for userRoot

dn: cn=objectclass,cn=index,cn=userRoot,cn=ldbm
database,cn=plugins,cn=config
objectClass: top
objectClass: nsIndex
cn: objectclass
nsSystemIndex: true
nsIndexIDListScanLimit: limit=-1 type=eq values=person
nsIndexType: eq

[3] Import 100k user LDIF
[4] Perform an ldapsearch using objectclass=person

ldapsearch -D "cn=directory manager" -w password -b "dc=example,dc=com" -xLLL objectclass=person dn

[5] Access log reports search as unindexed (notes=A)

Added automated test:

r8846 | rmeggins | 2014-06-26 08:45:09 -0600 (Thu, 26 Jun 2014) | 11 lines

Test for bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=1113605
https://bugzilla.redhat.com/show_bug.cgi?id=1113606
Test for ticket:
https://fedorahosted.org/389/ticket/47831

The bug is that the index config is lost when the server is restarted.
The test is simply to restart the server after the index config test,
and run the index config test again.  If the index config is preserved
at restart, then the index config test will PASS.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0416.html