ElasticSearch Old-Gen Heap filling up quickly

From our grafana logs, we see that our old-gen heap is filling up quickly (in 10 minutes).
We are using ES 6.7 with with 11 nodes and 28 shards. We have seen multiple outages when the old-gen heap is filling quickly. What does it mean? Is our heap too big/ number of shards too low/number of nodes too low/load too high? What does it indicate?

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