Filebeat registry permission setup does not allow all user access

[distrue]

Using filebeat v8.6.2, on linux environment.

$ uname -a
Linux ip-172-26-57-142 5.15.0-1031-aws #35-Ubuntu SMP Fri Feb 10 02:07:18 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

According to configuration docs, I should be available to grant previlage to all users to read by setup permission to 0644. But in actual, only registry directory is set into 644 and registry data file is set to 640 as below.

ubuntu@ip-172-26-57-142:~$ sudo ls -al /var/lib/filebeat/registry
total 12
drwxr-x--- 3 root root 4096 Mar  6 17:24 .
drwxr-x--- 3 root root 4096 Mar  6 17:24 ..
drwxr-x--- 2 root root 4096 Mar  6 17:24 filebeat
ubuntu@ip-172-26-57-142:~$ sudo ls -al /var/lib/filebeat/registry/filebeat
total 12
drwxr-x--- 2 root root 4096 Mar  6 17:24 .
drwxr-x--- 3 root root 4096 Mar  6 17:24 ..
-rw-r----- 1 root root    0 Mar  6 17:24 log.json # <-- permission is set to 640
-rw-r----- 1 root root   15 Mar  6 17:24 meta.json

This situation occurs in every time when I remove registry folder (I set it /var/lib/filebeat in example) and restart systemd filebeat daemon.

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