Max_file_descriptors not appearing in node process stats

GET _nodes/stats/process?filter_path=**.max_file_descriptors should give the max open file descriptors that has been configured for the process/user on the server.

However, I am not getting that setting. The above request returns {}
I could have sworn I was getting that setting earlier, and we have not upgraded elastic in a long-long time. Is there another reason why we would have that detail in the stats in the past, but no longer be getting it?

Running on jdk1.8.0_45 on RHEL.


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