code: @Override
      public UpdateClassifierResult updateClassifier(UpdateClassifierRequest request) {
          request = beforeClientExecution(request);
          return executeUpdateClassifier(request);
      }
docs: <p>
  Modifies an existing classifier (a <code>GrokClassifier</code>, an <code>XMLClassifier</code>, a
  <code>JsonClassifier</code>, or a <code>CsvClassifier</code>, depending on which field is present).
  </p>
  
  @param updateClassifierRequest
  @return Result of the UpdateClassifier operation returned by the service.
  @throws InvalidInputException
  The input provided was not valid.
  @throws VersionMismatchException
  There was a version conflict.
  @throws EntityNotFoundException
  A specified entity does not exist
  @throws OperationTimeoutException
  The operation timed out.
  @sample AWSGlue.UpdateClassifier
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/glue-2017-03-31/UpdateClassifier" target="_top">AWS API
  Documentation</a>