Maximum heap reached and GC not working


As can be seen in the attached screenshot, at around 06:45:20 the heap scrapes the limit, when the GC count is 0 for the next minute.
This causes this node to be unresponsive for this time period.

It happens quite frequently from various nodes in the cluster (there are 9 data nodes)

I got the GC logs but can't quite understand what causes it, except for the long "Safepoint cleanup" starting at 03:45:29

I am using ES version 7.7.1

What type of hardware are you using?

aws instance m5/m5a.4xlarge - 64GB, 16vCPU

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