Add support for mTLS

[ravindraprasad85]

Describe the bug
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This is not supporting mTLS , the same certificate is working fine with other application but not with the data prepper. I am using Data Prepper as helm chart and with latest code

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Environment (please complete the following information):

• OS: [e.g. Ubuntu 20.04 LTS]
• Version [e.g. 22]

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[kkondaka]

Please clarify which source/processor/sink needs this mTLS support.

[ravindraprasad85]

Hi @kkondaka , I do have requirement to use the data prepper in place of logstash , so when the source is kafka with mTLS based authentication (mutual TLS) it’s not able to read the certificate , while the same certificates are working fine with other apps .

Destination/Sink is Opensearch and in my case it’s password based authentication so working fine .

I need that dataprepper (image) helm chart must support the mTLS based authentication so that we can use it in our production environment.