code: public void setNodeAvailable(@Nullable final String nodeId, final boolean available) {
  		if ( _nodeIdService != null ) {
  			_nodeIdService.setNodeAvailable(nodeId, available);
  		}
  	}
docs: Mark the given nodeId as available as specified.
  @param nodeId the nodeId to update
  @param available specifies if the node was abailable or not