Support for client certificate authentication

[jammann]

I wanted to create a pipeline from one cluster to another with logstash. Both clusters are protected behind reverse proxies, which only speak SSL and require client certificates

The logstash-output-elastic nicely support that (keystore/truststore etc. properties) while the input only provides the ssl boolean config and the ca_certs PEM file. I did not find a way to configure proper client certificate authentication.

Could this feature be added or is there a fundamental issue which prevents that?

• Version: 5.4.0
• Operating System: Linux