My Logstash is not parsing data properly

I was looking at an error message that I got, and it appeared that there was an issue with my gsub. I removed it, and got no errors. Here is a stupid question, I'm sure, but, where should I adjust the naming of my columns?

I figured out how to get the field (column) names to display properly. I adjusted the first csv filter in my config, and everything appears to be parsing correctly now.