Also I am have trouble finding that template … where did it come from?
That looks like metricbeat logstash monitoring?
A couple other questions … Why do you need 3 shards… how much Data / GB / day is ingesting into that index… its monitoring data so usually that is low volume… so why 3 shards…
tl;dr changing the shards / replicas will probably not actually break anything BUT when you do an update (metricbeat or whatever owns that template) your changes may be overwritten.
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