stop logging not found files as errors

nginx/nginx.conf

@@ -68,6 +68,7 @@ http {
                     '"$http_referer" "$http_user_agent"';
     access_log /var/log/nginx/access.log main buffer=64k flush=1m;
     error_log /var/log/nginx/error.log;
+    log_not_found off;
 
     gzip_proxied any;
     gzip_vary on;