Filebeat.yml must be owned by the beat user (uid=0) or root

Hello,

why as of filebeat 5.3.0 filebeat.yml must be owned by the beat user (uid=0) or root?

filebeat2017/04/19 13:51:05.725413 beat.go:339: CRIT Exiting: error loading config file: config file ("/home/elastic/filebeat/filebeat.yml") must be owned by the beat user (uid=0) or root
Exiting: error loading config file: config file ("/home/elastic/filebeat/filebeat.yml") must be owned by the beat user (uid=0) or root

Why it is not enough for filebeat to have a read permission? (As it was enough under version e.g. 5.0.1)

Best regards

Please see Config File Ownership and Permissions.