The error message means that a client in a TLS handshake couldn't agree on a mutually supported cipher suite. This can be misleading , as it can also happen in the context of Java when one of the two is configured with no available keys for TLS.
Can you share with us:
- The exact command that you used to create the
PKCS#12files - The output of
openssl -in /opt/elasticsearch/config/elastic-certificates.p12 -info - The logs ( The exception stacktraces ) from a couple of your nodes.