code: public com.google.api.ads.adwords.axis.v201809.o.AdGroupEstimateRequest[] getAdGroupEstimateRequests() {
          return adGroupEstimateRequests;
      }
docs: Gets the adGroupEstimateRequests value for this CampaignEstimateRequest.
  
  @return adGroupEstimateRequests   * The list of ad groups to estimate. This field is required and
  should not be {@code null}. At
  least one ad group is required.
  
  <p>New campaigns may only contain new ad groups.
  If an
  {@link AdGroupEstimateRequest} has an adGroupId
  but the campaign is new,
  the API will return an error.
  <span class="constraint ContentsNotNull">This
  field must not contain {@code null} elements.</span>