The following current Beats documentation pages contain external links that 404:

• https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-module-zeek.html:
  https://www.zeek.org/manual/release/logs/index.html
• https://www.elastic.co/guide/en/beats/filebeat/current/ssl-client-fails.html:
  https://www.openssl.org/docs/manmaster/apps/s_client.html
• https://www.elastic.co/guide/en/beats/packetbeat/current/configuration-interfaces.html:
  http://lxr.free-electrons.com/source/Documentation/networking/packet_mmap.txt
• https://www.elastic.co/guide/en/beats/devguide/current/community-beats.html:
  https://discuss.elastic.co/c/beats/community-beats
  https://puppetlabs.com/facter