Mysterious error founded in the OD logs

Hi. I was just looking trough the logs cos of our RAID set failure. Checking that everything is working. I found a strange event in the logs what has happened a while back. Can anyone lighten me about what does this mean?

Apr 26 10:18:47 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:18:47 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:18:47 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:18:47 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:41 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:41 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:28:41 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:28:41 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:44: --- last message repeated 1 time ---

Apr 26 10:28:44 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:28:44 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:28:44 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:45: --- last message repeated 1 time ---

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:45: --- last message repeated 1 time ---

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:45: --- last message repeated 1 time ---

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:28:45 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:46: --- last message repeated 1 time ---

Apr 26 10:28:46 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:28:46 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:28:46 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 10:28:48: --- last message repeated 1 time ---

Apr 26 10:28:48 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 10:28:48 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 10:28:48 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 11:51:31 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 11:51:31 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 11:51:31 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 11:51:31 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 12:13:55 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 12:13:55 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 12:13:55 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 12:13:55 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 12:13:55: --- last message repeated 1 time ---

Apr 26 12:13:55 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 12:13:55 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 12:13:55 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Apr 26 12:13:56: --- last message repeated 1 time ---

Apr 26 12:13:56 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-nickname) not indexed

Apr 26 12:13:56 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-namesuffix) not indexed

Apr 26 12:13:56 sibeliusopisto slapd[65]: <= bdb_substring_candidates: (apple-emailcontacts) not indexed

Something serious or something else?