So I simply added Zscaler RootCA.crt to ubuntu server (where ELK is running) in /usr/share/ca-certificates and reconfigured ca-certficates dpkg. Now curl is not giving any certificate error but the Kibana is still giving the same error.
It looks like someone in this thread was having the same issue, and solved it using the NODE_EXTRA_CA_CERTS environment variable. You want to give that a shot and let us know if that fixes the issue for you?
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