code: public com.google.api.ads.adwords.axis.v201809.cm.ExtensionSetting getExtensionSetting() {
          return extensionSetting;
      }
docs: Gets the extensionSetting value for this CampaignExtensionSetting.
  
  @return extensionSetting   * The extension setting specifying which extensions to serve
  for the specified campaign. If
  extensionSetting is empty (i.e. has an empty list
  of feed items and null platformRestrictions),
  extensions are disabled for the specified extensionType.