Graylog memory usage is high

I have graylog installed on Ubuntu, a single node installation on a VM. it is consuming 90% of the memory allotted to it. I first started with 4gb and it was using 3.5 so I bumped up to 8 where it took 7.5. I stopped at 1ogb as I noticed the pattern.

IS this normal operation or is there a way to limit the available memory to it? I do have the memory set to half per the docs. Any suggestions?

-Xms1g
-Xmx1g

Sounds like an old version of the JDK that is not container aware

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