Replace Deprecated SSL Settings with their latest values (#17392) (#17398)

(cherry picked from commit 2a03d7e)

Co-authored-by: Rob Bavey <[email protected]>

Author: mergify[bot]

docs/static/security/pki-auth.asciidoc

@@ -11,12 +11,12 @@ client-certificate for authentication, you configure the `keystore` and
 output {
   elasticsearch {
     ...
-    keystore => /path/to/keystore.jks
-    keystore_password => realpassword
-    truststore =>  /path/to/truststore.jks <1>
-    truststore_password =>  realpassword
+    ssl_keystore_path => /path/to/keystore.jks
+    ssl_keystore_password => realpassword
+    ssl_truststore_path =>  /path/to/truststore.jks <1>
+    ssl_truststore_password =>  realpassword
   }
 }
 --------------------------------------------------
 <1> If you use a separate truststore, the truststore path and password are
-also required.
+also required.