code: public java.util.List<String> getScaleUpModifications() {
          if (scaleUpModifications == null) {
              scaleUpModifications = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return scaleUpModifications;
      }
docs: <p>
  A string list, each element of which specifies a cache node type which you can use to scale your cluster or
  replication group.
  </p>
  <p>
  When scaling up a Redis cluster or replication group using <code>ModifyCacheCluster</code> or
  <code>ModifyReplicationGroup</code>, use a value from this list for the <code>CacheNodeType</code> parameter.
  </p>
  
  @return A string list, each element of which specifies a cache node type which you can use to scale your cluster
  or replication group.</p>
  <p>
  When scaling up a Redis cluster or replication group using <code>ModifyCacheCluster</code> or
  <code>ModifyReplicationGroup</code>, use a value from this list for the <code>CacheNodeType</code>
  parameter.