Ticket #48940 - DS logs have warning:ancestorid not indexed

Description: When reindexing, the subtree to be reindexed is empty,
a cryptic warning message is logged in the error log:
  warning: ancestorid not indexed on 10; possibly, the entry id ##
  has no descendants yet.
This message is benign and not to be logged as DEBUG_ANY/FATAL.

The message is logged when the log level is set to BACKLDBM = 0x080000
  # vlvindex -Z test -n userRoot -T testIndex -d 524288
as follows:
  Info: Entry id ### has no descendants according to ancestorid. Index
  file created by this reindex will be empty.

https://fedorahosted.org/389/ticket/48940

Reviewed by [email protected] (Thank you, William!!)

ldap/servers/slapd/back-ldbm/ldif2ldbm.c

@@ -903,11 +903,10 @@ static IDList *ldbm_fetch_subtrees(backend *be, char **include, int *err)
         slapi_sdn_done(&sdn);
         if (idl == NULL) {
             if (DB_NOTFOUND == *err) {
-                LDAPDebug(LDAP_DEBUG_ANY,
-                    "warning: %s not indexed on %lu; "
-                    "possibly, the entry id %lu has no descendants yet.\n",
-                    entryrdn_get_noancestorid()?"entryrdn":"ancestorid",
-                    id, id);
+                LDAPDebug2Args(LDAP_DEBUG_BACKLDBM, 
+                    "Info: Entry id %lu has no descendants according to %s. "
+                    "Index file created by this reindex will be empty.\n",
+                    id, entryrdn_get_noancestorid()?"entryrdn":"ancestorid");
                 *err = 0; /* not a problem */
             } else {
                 LDAPDebug(LDAP_DEBUG_ANY,