docs: @Override
      public void processChallenge(String challenge) throws MalformedChallengeException {
          // Parse Challenge Data
          // Challenge is base64 string to be given to gss context
          if (StringUtils.hasText(challenge)) {
              // Remove leading auth scheme name and trim data
              this.challenge = challenge.substring(EsHadoopAuthPolicies.NEGOTIATE.length()).trim();
          }
      }