C:>logstash.bat agent -f logstash.conf

Using JAVA_HOME=C:Program FilesJavajre1.8.0_102 retrieved from C:ProgramDataOraclejavajavapathjava.exe
io/console not supported; tty will not be manipulated
Settings: Default pipeline workers: 4
Pipeline main started

input {
    file {
       path => "C:LogStashlogslogfile"
type => "log4net"
       codec => multiline {
                pattern => "^(DEBUG|WARN|ERROR|INFO|FATAL)"
                negate => true
                what => previous
            }
       }
 }
 filter {
   if [type] == "log4net" {
    grok {
       match => [ "message", "(?m)%{TIMESTAMP_ISO8601:sourceTimestamp} [Worker #%{NUMBER:threadId}] %{LOGLEVEL:level} %{GREEDYDATA:tempMessage}" ]
     }
     mutate {
         replace => [ "message" , "%{tempMessage}" ]
         remove_field => [ "tempMessage" ]
     }
   }
 }
 output {
   elasticsearch {
     hosts => ["http://XXXXX:9200"]
     user => "XXXXX"
     password => "XXXXX"
     index => "logstash-%{+YYYY.MM.dd}"
     template_overwrite => true
   }
 }