Use a conditional to install/remove the cron job that restarts the slapd service daily.

openldap-server/defaults/main.yml

@@ -46,6 +46,7 @@ openldap_slave_syncdata_type: accesslog
 openldap_slave_tls_starttls: 'yes' 
 
 openldap_cleaner_cron_job: False
+openldap_daily_restart: False
 openldap_letsencrypt_managed: False
 
 # Default: check once a day, purge the entries older than two days