Elastic Search Cluster going red

hello, I have a 3 node elastic cluster backing my graylog. I have replication factor 1 turned on, on all indexes. I was expecting that rebooting any single elastic node would make the cluster yellow. But recently it seems that rebooting an elastic node causing my cluster to go red.
Is there something i mis configured or missed that would cause this to happen?

Does the number of indexes and or index sets have any impact?

I am running graylog 3.3.4-1 on ubuntu 16.04
with elastic 6.8.11 and mongodb 4.0.19

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