SharePoint: How can I improve the search relevance of a list item? (How do I use RecordPageClick?)

In order to improve the relevance of a list item, I learnt about RecordClick.

Thankfully, I found the following code on Technet to resolve the problem. I have duplicated it here.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security;
using System.Threading.Tasks;
using Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client.Search;
using Microsoft.SharePoint.Client.Search.Query;
using System.IO;

namespace SPOnlinePageCallback2
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ClientContext clientContext = new ClientContext("https://xxxxxxx.sharepoint.com/"))
            {

                SecureString passWord = new SecureString();
                foreach (char c in "XXXXXXXX".ToCharArray()) passWord.AppendChar(c);
                clientContext.Credentials = new SharePointOnlineCredentials("xxxxxx@xxxxxx.onmicrosoft.com", passWord);

               
                StringBuilder sbOut = new StringBuilder();



            string resultTitleToClick = "tt";
            string resultUrlToClick = "https://xxxxxx.sharepoint.com/Lists/clist1/DispForm.aspx?ID=4";

            string immediacyQueryString = "tt";

           
            KeywordQuery keywordQuery = new KeywordQuery(clientContext);
            keywordQuery.RowLimit = 50;
            keywordQuery.QueryText = immediacyQueryString;
            keywordQuery.TrimDuplicates = true;
            keywordQuery.EnableStemming = true;
            keywordQuery.StartRow = 0;

            SearchExecutor searchExecutor = new SearchExecutor(clientContext);
            ClientResult<ResultTableCollection> resultTables = searchExecutor.ExecuteQuery(keywordQuery);

            clientContext.ExecuteQuery();
           
            //pageImpressionId_partitionBucket_LCID (1131_1820_1033)
            //NOTE: pageImpressionId is the search result page Id that it will change every time
            string pageInfo = resultTables.Value.Properties["piPageImpression"].ToString();

            string clickType = "Result";


            string immediacySourceId = resultTables.Value.Properties["SourceId"].ToString();
                //Microsoft.SharePoint.Client.Search.Query.
            ResultTable relevantResults = resultTables.Value.Where(
                result => result.TableType == KnownTableTypes.RelevantResults).FirstOrDefault(result => result.QueryRuleId == "00000000-0000-0000-0000-000000000000");

            List<IDictionary<string, object>> resultRows = (List<IDictionary<string, object>>)relevantResults.ResultRows;


            //int clickResultBlockId = (int)relevantResults.Properties["piPageImpressionBlockType"];
            int blockType = (int)relevantResults.Properties["piPageImpressionBlockType"];

            int subResultIndex = 0;

            //var clickThroughResult = resultRows[5];
            //string clickResultId = (string)relevantResults.Properties["piSearchResultId"];

            Dictionary<string, object> clickThroughResult = null;
            foreach(Dictionary<string, object> resultRow in resultRows)
            {
                string resultTitle = (string)resultRow["Title"];
                string resultUrl = (string)resultRow["Path"];
                if ((resultTitle.ToLower() == resultTitleToClick.ToLower()) && (resultUrl.ToLower() == resultUrlToClick.ToLower()))
                {
                    clickThroughResult = resultRow;
                    break;
                }
            }
            //var clickThroughResult = resultRows[1];
            if (clickThroughResult != null)
            {
                string clickedResultId = (string)clickThroughResult["piSearchResultId"];
                string immediacyTitle = (string)clickThroughResult["Title"];
                string immediacyUrl = (string)clickThroughResult["Path"];

               
                searchExecutor.RecordPageClick(pageInfo, clickType, blockType, clickedResultId, subResultIndex, immediacySourceId, immediacyQueryString, immediacyTitle, immediacyUrl);
                clientContext.ExecuteQuery();
               
                sbOut.Append(clickedResultId + "\r\n");
                sbOut.Append(immediacyTitle + "\r\n");
                sbOut.Append(immediacyUrl + "\r\n");
                sbOut.Append("Clicked");
            }

            int resultCount = resultRows.Count;
            Console.Write(sbOut.ToString());

                Console.ReadLine();
            }
        }
    }
}