pielas

@sscarduzio it's generally ready. I just need to fix issues with tests on pipeline

@coutoPL ah, it turns out that BouncyCastle library, which I included to handle PEM files, causes JAR hell like other BouncyCastle libraries. Could we just exclude support for PEM files...

@sscarduzio No, it's not required. However parsing it without bouncy castle is more troublesome. Here's `loadPrivateKey` function without using BC https://github.com/sscarduzio/elasticsearch-readonlyrest-plugin/pull/826/commits/efc9cde59904de6e021d70f300617244a45e747b#diff-1f6f852b3a8af9460e226a8940a31dd40d6b941674985610d0328e709292c3dd As you can see it requires to do few...

@sscarduzio I will close it as soon as possible. However I haven't felt well in recent days. I will try to wrap this up in the following days