Graylog-Installation does not work anymore

The ES-issue is something around this: Elasticsearch no longer works under systemd (7.4.0 on CentOS 7.7.1908)? - Elasticsearch - Discuss the Elastic Stack

But still the startup issues with GL, even when I remove that tempfile, “chmod 777” it etc

It looks like this:

-rw-r--r--. 1 graylog graylog 112848 Feb 15 13:18 jna2528244358987533199.tmp

so I would assume that the graylog-server which runs with

User=graylog
Group=graylog

should be allowed to fully access it. As far as I see it creates it anyway.

I’d appreciate any help here, I should get this box up and running asap.

Maybe I have to upgrade to some other releases of ElasticSearch or Graylog here?