The logstash is not parsing the csv logs files automatically. It works only after I reopen the file and save it again.
Sometimes, if the log files are more than 1GB, opening the files with Excel ( or any other editor) is either giving issues, or saving it causing the files to be truncated to the maximum file size supported by Excel ( or other tools ).
Software details
Logstash 2.2.2
Windows 7
Microsoft Excel for viewing the CSV data