gistfile1.txt

  multiline {
    pattern => "\d\d\/\d\d\/\d\d\d\d \d\d\:\d\d\:\d\d\.\d\d\*"
    add_tag => [ "extra_line" ]
    what => previous
  }
  date {
    tags => [ "extra_line" ]
    match => [ "datetime", "MM/dd/YYYY HH:mm:ss.SS*" ]
  }
  date {
    exclude_tags => [ "extra_line" ]
    match => [ "datetime", "MM/dd/YYYY HH:mm:ss.SS" ]
  }

Failed parsing date from field {:field=>"datetime", :value=>"08/06/2013 14:50:19.94", :exception=>java.lang.IllegalArgumentException: Invalid format: "08/06/2013 14:50:19.94" is too short, :level=>:warn}