Elastic Search Yellow - Log Collector

Greetings folks,

I have a Log collector with the health status showing yellow due to ES (Elastic Search). I ran the cli command: show log-collector-es-cluster health, and got

"active_shards_percent_as_number" : 90.68101105910225

That number is supposed to be at 100% as I found out.

Any idea what could be done here?