389-DS Internal unindexed search

[Ciber dgtnt]

Hi, I have a problem in 389-ds version 1.3.10.2-10 intalled on Centos7 , we have a
multimaster enviroment with consumers and suppliers, we have referential integrity plugin
to control the group members. In the master node where we have the referential integrity
pluggin enabled, ocasionally we get this message in the error log :

NOTICE - ldbm_back_search - Internal unindexed search: source (cn=referential integrity
postoperation,cn=plugins,cn=config) search base="c=es" scope=2
filter="(member=*uid=dmarmedr,ou=Baja de cuentas,c=es)" conn=0 op=0
NOTICE - ldbm_back_search - Internal unindexed search: source (cn=referential integrity
postoperation,cn=plugins,cn=config) search base="c=es" scope=2
filter="(uniquemember=*uid=dmarmedr,ou=Baja de cuentas,c=es)" conn=0 op=0
NOTICE - ldbm_back_search - Internal unindexed search: source (cn=referential integrity
postoperation,cn=plugins,cn=config) search base="c=es" scope=2
filter="(owner=*uid=dmarmedr,ou=Baja de cuentas,c=es)" conn=0 op=0
NOTICE - ldbm_back_search - Internal unindexed search: source (cn=referential integrity
postoperation,cn=plugins,cn=config) search base="c=es" scope=2
filter="(seeAlso=*uid=dmarmedr,ou=Baja de cuentas,c=es)" conn=0 op=0

And when it happends the slapd proccess takes up to 100% CPU usage and we see the message
you can see bellow, because this master node begins to avoid replication sessions from
other master nodes:

ERR - NSMMReplicationPlugin - process_postop - Failed to apply update
(615f51ea000000230000) error (51). Aborting replication session(conn=1145 op=4)

All those internal unindexed searchs have filters with the attributes configured in the
referential integrity plugin, member=*, uniquemember=*, owner=* and seealso=*. Those
attributes has equality and presence indexes, we don't understand why the log says
"internal unindexed search".

Can anyone help me with this problem?, maby is it necessary other type of index?

Thanks & Regards