code: public DescribeReservedElasticsearchInstanceOfferingsResult withReservedElasticsearchInstanceOfferings(
              ReservedElasticsearchInstanceOffering... reservedElasticsearchInstanceOfferings) {
          if (this.reservedElasticsearchInstanceOfferings == null) {
              setReservedElasticsearchInstanceOfferings(new java.util.ArrayList<ReservedElasticsearchInstanceOffering>(
                      reservedElasticsearchInstanceOfferings.length));
          }
          for (ReservedElasticsearchInstanceOffering ele : reservedElasticsearchInstanceOfferings) {
              this.reservedElasticsearchInstanceOfferings.add(ele);
          }
          return this;
      }
docs: <p>
  List of reserved Elasticsearch instance offerings
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setReservedElasticsearchInstanceOfferings(java.util.Collection)} or
  {@link #withReservedElasticsearchInstanceOfferings(java.util.Collection)} if you want to override the existing
  values.
  </p>
  
  @param reservedElasticsearchInstanceOfferings
  List of reserved Elasticsearch instance offerings
  @return Returns a reference to this object so that method calls can be chained together.