docs: public synchronized Servlet removeServletByAlias(String alias) {
          final boolean destroy = true;
  
          Servlet servlet = this.aliasMap.remove(alias);
          this.container.removeContextRoot(alias);
  
          ServletHandler handler = this.servletMap.remove(servlet);
          if (handler != null) {
              updateServletArray();
              if (destroy) {
                  handler.destroy();
              }
          } else {
              throw new IllegalArgumentException("Servlet is not registered: " + servlet);
          }
  
          return servlet;
      }