code: @Override
      public DescribeServersResult describeServers(DescribeServersRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeServers(request);
      }
docs: <p>
  Lists all configuration management servers that are identified with your account. Only the stored results from
  Amazon DynamoDB are returned. AWS OpsWorks CM does not query other services.
  </p>
  <p>
  This operation is synchronous.
  </p>
  <p>
  A <code>ResourceNotFoundException</code> is thrown when the server does not exist. A
  <code>ValidationException</code> is raised when parameters of the request are not valid.
  </p>
  
  @param describeServersRequest
  @return Result of the DescribeServers operation returned by the service.
  @throws ValidationException
  One or more of the provided request parameters are not valid.
  @throws ResourceNotFoundException
  The requested resource does not exist, or access was denied.
  @throws InvalidNextTokenException
  This occurs when the provided nextToken is not valid.
  @sample AWSOpsWorksCM.DescribeServers
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/opsworkscm-2016-11-01/DescribeServers" target="_top">AWS API
  Documentation</a>