filter

filter {
  if [type] == "odoo" {
    grok {
      match => { "message" => "%{ODOOLOG}" }
    }
    date {
      match => [ "timestamp", "yyyy-MM-dd HH:mm:ss,SSS" ]
    }
  }
}

input

input {
  file {
    type => "odoo"
    path => "/path/to/server.log"
    codec => multiline {
      pattern => "^%{TIMESTAMP_ISO8601} "
      negate => true
      what => previous
    }
  }
}

pattern

WERKZEUGREQUESTTIMESTAMP %{MONTHDAY}/%{MONTH}/%{YEAR} %{TIME}
WERKZEUGREQUEST %{IPORHOST:client} %{USER:ident} %{USER:auth} \[%{WERKZEUGREQUESTTIMESTAMP:request_timestamp}\] "%{WORD:request_type} %{URIPATHPARAM:request} HTTP/%{NUMBER:httpversion}" %{NUMBER:response} -
ODOOMISC %{GREEDYDATA}
ODOOLOG %{TIMESTAMP_ISO8601:timestamp} %{POSINT:pid} %{LOGLEVEL:level} (?:%{USERNAME:user}|\?) %{PROG:module}: (?:%{WERKZEUGREQUEST}|%{ODOOMISC:misc})