code: public String unassignedNodeLeftDelayedTimeout(String indice,String delayedTimeout){
  		StringBuilder builder = new StringBuilder().append(indice).append("/_settings");
  		StringBuilder updateDsl = new StringBuilder();
  		updateDsl.append("{").append("\"settings\":{")
  				.append("\"index.unassigned.node_left.delayed_timeout\":\"").append(delayedTimeout)
  				.append("\"}}");
  		return this.client.executeHttp(builder.toString(),updateDsl.toString(),ClientInterface.HTTP_PUT);
  	}
docs: {
  "settings":{
  "index.unassigned.node_left.delayed_timeout":"1d"
  }
  }
  @param delayedTimeout
  @return