How did you configure your Beat’s log shipper? Oh NVM your using GL sidecar.
Under [logstash] I think you may need to set those certificates.
For example:
# List of root certificates for HTTPS server verifications
ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]
# Certificate for SSL client authentication
ssl.certificate: "/etc/pki/client/cert.pem"
# Client Certificate Key
ssl.key: "/etc/pki/client/cert.key"
