code: public java.util.List<ReshardingConfiguration> getReshardingConfiguration() {
          if (reshardingConfiguration == null) {
              reshardingConfiguration = new com.amazonaws.internal.SdkInternalList<ReshardingConfiguration>();
          }
          return reshardingConfiguration;
      }
docs: <p>
  Specifies the preferred availability zones for each node group in the cluster. If the value of
  <code>NodeGroupCount</code> is greater than the current number of node groups (shards), you can use this
  parameter to specify the preferred availability zones of the cluster's shards. If you omit this parameter
  ElastiCache selects availability zones for you.
  </p>
  <p>
  You can specify this parameter only if the value of <code>NodeGroupCount</code> is greater than the current
  number of node groups (shards).
  </p>
  
  @return Specifies the preferred availability zones for each node group in the cluster. If the value of
  <code>NodeGroupCount</code> is greater than the current number of node groups (shards), you can use this
  parameter to specify the preferred availability zones of the cluster's shards. If you omit this parameter
  ElastiCache selects availability zones for you.</p>
  <p>
  You can specify this parameter only if the value of <code>NodeGroupCount</code> is greater than the
  current number of node groups (shards).