@type parser reserve_data true format grok key_name message grok_pattern %{IPORHOST:clientip} %{HTTPDUSER:ident} %{USER:auth} \[%{HTTPDATE:Timestamp}\] "(?:%{WORD:http_method} %{NOTSPACE:http_url}(?: HTTP/%{NUMBER:http_version})?|%{DATA:rawrequest})" %{NUMBER:http_status} (?:%{NUMBER:http_bytes}|-) (?:%{NUMBER:http_response_time_us}|-) %{QS:referrer} %{QS:agent} time_key Timestamp time_format %d/%b/%Y:%H:%M:%S %z keep_time_key true