How to fetch all the files which is modified or added yesterday from SharePoint document library

I am trying to fetch all the files which is modified or added yesterday from SharePoint document library using below code.

 using (ClientContext clientCtx = GetContext())
                {
                    Web oweb = clientCtx.Web;
                    var getListQuery = from list in oweb.Lists.Include(list => list.RootFolder) where list.BaseTemplate == 101 && list.Hidden == false select list;
                    var allDocLibraries = clientCtx.LoadQuery(getListQuery);
                    clientCtx.ExecuteQuery();
                    foreach (var library in allDocLibraries)
                    {
                        DateTime yesterday = DateTime.Today.AddDays(-1);
                        string rootFolder = library.RootFolder.Name;
                        var keywordQuery = new KeywordQuery(clientCtx);
                        string librarPath = clientCtx.Url + rootFolder + "/*";
                        string yesterdayDate = yesterday.Month.ToString() + "/" + yesterday.Day.ToString() + "/" + yesterday.Year;
                        keywordQuery.QueryText = "contenttype:document AND LastModifiedTime>=" + yesterdayDate + " AND path:" + HttpUtility.UrlPathEncode(librarPath, true);
                        //keywordQuery.QueryText = "ContentClass:STS_ListItem_documentLibrary AND LastModifiedTime>=" + yesterdayDate + " AND path:" + HttpUtility.UrlPathEncode(librarPath, true);
                        //keywordQuery.QueryText = "(contentclass:STS_ListItem OR IsDocument:True) AND LastModifiedTime>=" + yesterdayDate + " AND path:" + HttpUtility.UrlPathEncode(librarPath, true);
                        //keywordQuery.TrimDuplicates = false;
                        //keywordQuery.RowLimit = 500;
                        var searchExecutor = new SearchExecutor(clientCtx);
                        var searchResult = searchExecutor.ExecuteQuery(keywordQuery);
                        clientCtx.ExecuteQuery();
                        var allRecentFiles = searchResult.Value[0].ResultRows.ToList();
                        foreach (var file in allRecentFiles)
                        {
                            strLog.AppendLine("File path - " + file["OriginalPath"].ToString());
                            filecount++;
                        }
                    }
                    strLog.AppendLine("Total nummber files updated:" + filecount);
                }



But the above query fetches only few files(only jpg files not the doc files) not all the files from doc library. Any idea what went wrong in my code. Thanks in advance.