code: @Override
      public CacheSecurityGroup revokeCacheSecurityGroupIngress(RevokeCacheSecurityGroupIngressRequest request) {
          request = beforeClientExecution(request);
          return executeRevokeCacheSecurityGroupIngress(request);
      }
docs: <p>
  Revokes ingress from a cache security group. Use this operation to disallow access from an Amazon EC2 security
  group that had been previously authorized.
  </p>
  
  @param revokeCacheSecurityGroupIngressRequest
  Represents the input of a <code>RevokeCacheSecurityGroupIngress</code> operation.
  @return Result of the RevokeCacheSecurityGroupIngress operation returned by the service.
  @throws CacheSecurityGroupNotFoundException
  The requested cache security group name does not refer to an existing cache security group.
  @throws AuthorizationNotFoundException
  The specified Amazon EC2 security group is not authorized for the specified cache security group.
  @throws InvalidCacheSecurityGroupStateException
  The current state of the cache security group does not allow deletion.
  @throws InvalidParameterValueException
  The value for a parameter is invalid.
  @throws InvalidParameterCombinationException
  Two or more incompatible parameters were specified.
  @sample AmazonElastiCache.RevokeCacheSecurityGroupIngress
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticache-2015-02-02/RevokeCacheSecurityGroupIngress"
  target="_top">AWS API Documentation</a>