Elasticsearch 6.1.1 client running OOM and dumping heap

We are having troubles with Elasticsearch 6.1.1 running in client mode. Basically it runs as a frontend for bulk requests from log stash and queries from Kibana. Analyzing the heap dump shows about half the memory is taken by the clientHandlers ConcurrentMapLong in Transport:

Can anyone provide some insight into how we can prevent this? Is it possibly a memory leak? Happy to provide more information!

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