docs: private void initializeRequestHandler(ResponseBuilder rb) {
  		if (requestHandler == null) {
  			// try to initialize
  			for (Entry<String, SolrInfoBean> entry : rb.req.getCore().getInfoRegistry().entrySet()) {
  				if (entry.getValue() instanceof MtasRequestHandler) {
  					requestHandlerName = entry.getKey();
  					requestHandler = (MtasRequestHandler) entry.getValue();
  					break;
  				}
  			}
  		}
  	}