Hi everybody, I will try explaining my problem here and I hope someone can help me since I am trying to get a an answer for almost 2 weeks now.
So I downloaded the following projects:
-Elasticsearch
-Logstash
-Kibana
(also these plugins;
-filebeat
-packetbeat
I installed all of them and run the command: (ofcourse instead of elasticsearch I typed all the projects seperately).
-systemctl daemon-reload
-systemctl enable elasticsearch.service
-systemctl start elasticsearch.service
-systemctl status elasticsearch
& they are all active and the status is green which means they are probably working fine, but whenever I try to add an index pattern I somehow can't create a logstash one (nor the other ones do). 
Greetings,
Ebbe