--client-key

Allows the use of a specified SSL client key file to authenticate to Elasticsearch. If using --client-cert and the file specified does not also contain the key, use --client-key to specify the file containing the SSL key. The key file must be an unencrypted key in PEM format.

Connect to a cluster at https://example.com/ via SSL using SSL client authentication:

curator --host example.com --port 443 --use_ssl \
        --certificate /path/to/cacert.pem \
        --client-cert /path/to/clientcert.pem \
        --client-key /path/to/clientkey.pem \
        <<command>> <<flags>>