HTTPD (Apache) combined grok pattern failing due to none interger response code

[tomrade]

Ive noticed that ina few rare cases in some apache logs I have analysed there log lines when the response code field is "-" , the HTTPD grok pattern expects it always to be %{NUMBER}. Not sure if it should be changed upstream to (?:%{NUMBER}|-), or if it is deemed so rare its a non issue

• Version:
  Logstash 6.0 (deb)
  Log Line
  210.79.229.15 - - [28/Jan/2014:08:59:29 -0600] "GET /template/js/javascript.js?dc=52e7c5c2c4fcc HTTP/1.0" - 0 "REF" "UA"

[landorg]

My workaround was to add - to the IPORHOST pattern in a custom pattern file:

IPORHOST (?:%{HOSTNAME}|%{IP}|-)

[kares]

addressed at #282, expected to be available with the 4.2.0 release