Your original find command was correct you SHOULD NOT be removing freeswitch.log
freeswitch.log is the current log file that FreeSWITCH is writing to. files that end in 1, 2, 3 etc are the rotated logs that the find using freeswitch.log.* deletes.
If you do not see any files called freeswitch.log.1 freeswithc.log.2 (3, 4, 5) etc. then your log has not rotated since the last time files were deleted. There could be many reasons for this but it could be that your log file has not yet grown large enough. The default install sets the log rotate size to 10485760. Check the current size of your log and then see what is specified in /etc/freeswitch/autoload_configs/logfile.conf.xml