code: @Override
      public DescribeCacheClustersResult describeCacheClusters(DescribeCacheClustersRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeCacheClusters(request);
      }
docs: <p>
  Returns information about all provisioned clusters if no cluster identifier is specified, or about a specific
  cache cluster if a cluster identifier is supplied.
  </p>
  <p>
  By default, abbreviated information about the clusters is returned. You can use the optional
  <i>ShowCacheNodeInfo</i> flag to retrieve detailed information about the cache nodes associated with the
  clusters. These details include the DNS address and port for the cache node endpoint.
  </p>
  <p>
  If the cluster is in the <i>creating</i> state, only cluster-level information is displayed until all of the
  nodes are successfully provisioned.
  </p>
  <p>
  If the cluster is in the <i>deleting</i> state, only cluster-level information is displayed.
  </p>
  <p>
  If cache nodes are currently being added to the cluster, node endpoint information and creation time for the
  additional nodes are not displayed until they are completely provisioned. When the cluster state is
  <i>available</i>, the cluster is ready for use.
  </p>
  <p>
  If cache nodes are currently being removed from the cluster, no endpoint information for the removed nodes is
  displayed.
  </p>
  
  @param describeCacheClustersRequest
  Represents the input of a <code>DescribeCacheClusters</code> operation.
  @return Result of the DescribeCacheClusters operation returned by the service.
  @throws CacheClusterNotFoundException
  The requested cluster ID does not refer to an existing cluster.
  @throws InvalidParameterValueException
  The value for a parameter is invalid.
  @throws InvalidParameterCombinationException
  Two or more incompatible parameters were specified.
  @sample AmazonElastiCache.DescribeCacheClusters
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticache-2015-02-02/DescribeCacheClusters"
  target="_top">AWS API Documentation</a>