It's not the real issue. I introduced that while anonymizing the data. It's that a 3-5 liner code became a huge switch case by just incrementing the code and never thinking how it should be done. This was caused by like 15 engineers in time :)
Something like below would be huge improvement:
subs1 = ["cluster1", "cluster2"]
if subs1.contains(clusterName) return subs1