auto balSettingsResult = grid.catalogManager()->getGlobalSettings(SettingsType::BalancerDocKey);
const bool isBalSettingsAbsent = balSettingsResult.getStatus() == ErrorCodes::NoSuchKey;                
if (!balSettingsResult.isOK() && !isBalSettingsAbsent) {
    warning() << balSettingsResult.getStatus();
    return;
}
const SettingsType& balancerConfig = balSettingsResult.getValue();