I have the below logformat , I need to store the timezone of the original timestamp's timezone in characters.
10.68.36.27 - firstname.lastname@example.org [05/Feb/2018:14:52:23 -0600] "GET /content/web/cnt2626024 HTTP/1.1" 200 1543 "https://mysite.com/index.htm" "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0" "10.39.197.233" "image/png"
if the timestamp is [05/Feb/2018:14:52:23 -0600], i have to convert the -0600 to the timezone CST and store it as separate timezone field in ES.
if it is -0500 , I need that to be stored as EST.
Any help how to achieve this using grok or anyother filter plugin ?