using System;

public class Program

{

    public static void Main()

    {

         const string DEFAULT_BOOST_REPLACEMENT_VARIABLE = "{DEFAULT_BOOST_FUNCTION}";

​

         const string relevancyParameter = "{{!payload_score f=Tags func=max}}{0}";

​

         const string searchTerm = "test";

​

         var qqq = string.Format(relevancyParameter, searchTerm);

        Console.WriteLine(qqq);

    }

}