code: public void setAutoDiscoveryDataCenter(String dataCenter) {
      if (StringUtils.isNotBlank(dataCenter)) {
        this.autoDiscoveryDataCenters = Arrays.asList(dataCenter);
      }
    }
docs: Sets the local datacenter for the DiscoveryService. Nodes out of this
  datacenter will be discarded. For configuration simplicity, you can provide
  an empty or null string with the effect being the same as if you had not set
  this property.
  @param dataCenter DataCenter name