Logstash CPU load metric always -1

Hey all.
I am having some trouble with monitoring Logstash in our ELK setup that i hope some of you have experienced as well.
When i look at the CPU load of our logstash nodes they always says -1.
When i call 'host:9600/_node/stats/process?pretty' to get the metrics, i get this as output:

"cpu" : {
"total_in_millis" : -1,
"percent" : -1,
"load_average" : null

Do logstash need special rights to collect that information from the OS ?
I am running logstash 5.4 with administrator rights on a Windows Server 2016 machine.

Thanks, Martin.

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