GC overhead - but heaps of free memory?

Whenever I do a search in Kibana I see
: [2018-02-24T22:16:19,009][INFO ][o.e.m.j.JvmGcMonitorService] [HUCBRNR] [gc][124359] overhead, spent [286ms] collecting in the last [1s]
in the log - but I find it very strange as I have -Xmx12g -Xms12g, and in x-pack I see the heap usage is quite low:

5GB / 12GB

running 6.2.2

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