What does this warning mean? Selector return prematurely

Elastic Stack Elasticsearch
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I have nodejs server that is trying to push alot of docs into elasticsearch (single node).
I get these messages in my elastic log:
[2019-07-18T12:36:50,705][WARN ][i.n.c.n.NioEventLoop ] Selector.select() returned prematurely 512 times in a row; rebuilding Selector sun.nio.ch.EPollSelectorImpl@1399938e.
[2019-07-18T12:36:50,705][WARN ][i.n.c.n.NioEventLoop ] Selector.select() returned prematurely 512 times in a row; rebuilding Selector sun.nio.ch.EPollSelectorImpl@1399938e.
[2019-07-18T12:36:52,614][INFO ][i.n.c.n.NioEventLoop ] Migrated 32 channel(s) to the new Selector.
[2019-07-18T12:36:52,614][INFO ][i.n.c.n.NioEventLoop ] Migrated 32 channel(s) to the new Selector.

What does that mean?
I might add that not long after, while trying to push more docs, elastic crashes.

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