Christian ,What we are looking here is we have data stream or like logs which logstash is fetching up from logs and then passing it to elasticsearch
here is the flow
Logs:-->Logstash agent:-->Redis:-->Logstash collector:-->Elasticsearch :--> Kibana
Now when we see graphs at Kibana graphs are distorted ,I need to know why ? or if you let me know how raw data i.e data from logs gets converted from raw to graphical presentation we might be able to troubleshott at which point data is facing the problem to get it converted to graphical form .
Let me know if it helps