code: public void setUpgradeHistories(java.util.Collection<UpgradeHistory> upgradeHistories) {
          if (upgradeHistories == null) {
              this.upgradeHistories = null;
              return;
          }
  
          this.upgradeHistories = new java.util.ArrayList<UpgradeHistory>(upgradeHistories);
      }
docs: <p>
  A list of <code> <a>UpgradeHistory</a> </code> objects corresponding to each Upgrade or Upgrade Eligibility Check
  performed on a domain returned as part of <code> <a>GetUpgradeHistoryResponse</a> </code> object.
  </p>
  
  @param upgradeHistories
  A list of <code> <a>UpgradeHistory</a> </code> objects corresponding to each Upgrade or Upgrade
  Eligibility Check performed on a domain returned as part of
  <code> <a>GetUpgradeHistoryResponse</a> </code> object.