Creating geoip data for internal networks

Hi @bastianhoss,
Unsure if you fixed this or not, but I ran into this issue yesterday so I'll post what I wound up doing for future searches...

 if [client_address] =~ /^10\./  {
  mutate { replace      => { "[geoip][timezone]"      => "Pacific/Auckland" } }
  mutate { replace     .....
} else {
  geoip {
    source => "client_address"
    target => "geoip"
    add_tag => [ "nginx-geoip" ]
  }
}