indexer.conf search.htm
LogLevel {number}
Sets verbosity level for logging to stderr and/or syslog. The number can vary from 0 (silent) to 6 (full logging). The default value is 0 for search.cgi and 3 for indexer. Verbosity level for indexer can be changed using -v command line flag.
LogLevel 6
CustomLog, SyslogFacility.