Reduce log level in HttpJwtAuthenticator if request cannot be authent…

…icated (opensearch-project#4913)

Signed-off-by: Craig Perkins <[email protected]>

src/main/java/com/amazon/dlic/auth/http/jwt/HTTPJwtAuthenticator.java

@@ -215,7 +215,7 @@ private AuthCredentials extractCredentials0(final SecurityRequest request) {
                 }
             }
         }
-        log.error("Failed to parse JWT token using any of the available parsers");
+        log.debug("Unable to authenticate JWT Token with any configured signing key");
         return null;
     }