Logstash config for IIS logs

Taking help from this article, I came up with a logstash.conf file that works both for IIS and apache tomcat at the same time.

input {

    file {    
         
 path => ["C:/inetpub/logs/LogFiles/W3SVC1/*.log"]
  type => ["iislog"]
    }

file {    
         
         path => ["C:/Program Files/apache-tomcat-7.0.55/logs/*.txt"]
    type => ["tomcatTxtLog"]
    }

}


filter {
  if [type] == "iislog" {
 
         #ignore log comments
         if [message] =~ "^#"
{
            drop {}
         }
grok {
             
 match => ["message", "%{TIMESTAMP_ISO8601:log_timestamp} %{WORD:iisSite} %{IPORHOST:site} %{NOTSPACE:Sip} %{NOTSPACE:verb} %{URIPATH:request} %{NOTSPACE:QueryString} %{NUMBER:port} %{NOTSPACE:Hyphen1} %{NOTSPACE:Cip} %{NOTSPACE:httpversion} %{NOTSPACE:UserAgent} %{NOTSPACE:Hyphen2} %{NOTSPACE:Hyphen3} %{NOTSPACE:referer} %{NUMBER:response} %{NUMBER:subresponse} %{NUMBER:scstatus} %{NUMBER:bytes:int} %{NUMBER:timetaken:int}"]
            }
date
{
            match => [ "log_timestamp", "YYYY-MM-dd HH:mm:ss" ]
       timezone => "Etc/GMT"
         }
mutate {
            remove_field => [ "Hyphen1","Hyphen2","Hyphen3","Sip","Cip","log_timestamp"]
         }
     }
  else if [type] == "tomcatTxtLog" {
  #ignore log comments
  if [message] =~ "^#"
{
            drop {}
         }
         grok {
           match => ["message", "%{COMMONAPACHELOG}"]
           }
  date
  {    
            match => [ "timestamp", "dd/MMM/yyyy:HH:mm:ss Z" ]
            timezone => "Etc/GMT"
           }
   mutate {
            remove_field => [ "timestamp"]
         }
 
     }
}

output{
   elasticsearch {
     cluster=>"VivekLocalMachine"
      port => "9200"
      protocol => "http"
    }
}