code: public void setCampaignEstimateRequests(com.google.api.ads.adwords.axis.v201809.o.CampaignEstimateRequest[] campaignEstimateRequests) {
          this.campaignEstimateRequests = campaignEstimateRequests;
      }
docs: Sets the campaignEstimateRequests value for this TrafficEstimatorSelector.
  
  @param campaignEstimateRequests   * A list of all campaigns to estimate.<p>
  
  To create a Keyword estimates request, use {@code
  null} campaign id.
  <span class="constraint CollectionSize">The maximum
  size of this collection is 5.</span>
  <span class="constraint ContentsDistinct">This field
  must contain distinct elements.</span>
  <span class="constraint ContentsNotNull">This field
  must not contain {@code null} elements.</span>
  <span class="constraint NotEmpty">This field must
  contain at least one element.</span>
  <span class="constraint Required">This field is required
  and should not be {@code null}.</span>