Plugin should support SSL keys in standard PEM/PKCS#1 format #125
Description
Although it does not appear to be documented the client_key apparently must be in PKCS#8 format. The key generated by the elastisearch-certutil tool is in PKCS#1 format and must be converted before using it. It would be good if these could agree, or the plugin was capable of supporting PKCS#1 in some way.