Fix compile issues introduced by merge

The build was broken due to some issues with the merging of elastic#32018. A
method that was public went private before the PR was merged. That did
not cause a merge conflict (so the PR was merged successfully). But it
did cause the build to fail.

Author: Tim-Brooks

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/transport/nio/SecurityNioHttpServerTransport.java

@@ -59,7 +59,7 @@ public SecurityNioHttpServerTransport(Settings settings, NetworkService networkS
         this.sslEnabled = HTTP_SSL_ENABLED.get(settings);
         this.sslService = sslService;
         if (sslEnabled) {
-            this.sslConfiguration = sslService.sslConfiguration(SSLService.getHttpTransportSSLSettings(settings), Settings.EMPTY);
+            this.sslConfiguration = sslService.getHttpTransportSSLConfiguration();
             if (sslService.isConfigurationValidForServerUsage(sslConfiguration) == false) {
                 throw new IllegalArgumentException("a key must be provided to run as a server. the key should be configured using the " +
                     "[xpack.security.http.ssl.key] or [xpack.security.http.ssl.keystore.path] setting");