How can we parse the fields using logstash?

Hi,

i’m trying to parse some of the fields using logstash, for this i’m using grok filter plugin.

this is my sample http log message generated by nginx-

localhost - - [28/Jul/2020:09:11:42 +0000] “GET /_cat/indices HTTP/1.1” 401 0 “-” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36” “-” 0.007 req_body:"-"

and my grok filter plugin is-

match => ["message", "%{IPORHOST:clientip} (?:-|(%{WORD}.%{WORD})) %{USER:ident} \[%{HTTPDATE:timestamp}\] (?: %{WORD:verb} %{URIPATHPARAM:request} (?: HTTP/%{NUMBER:httpversion})?|%{DATA:rawrequest}) %{NUMBER:response} (?:%{NUMBER:bytes}|-) %{QS:referrer} %{QS:agent} %{QS:forwarder} %{BASE10NUM:request_duration} %{WORD:req_body}"]

and i want to parse out the fields like method, request, request body using logstash.
how can i accomplish this? any suggestions would be helpful.
Thanks!