Logstash locks file on Windows Server

Hi,
I've logstash 1.5.4 running on Win server 2008 R2.
Its locking my application log, allowing it to rotate but it can't be deleted.
My conf looks like this:

input {
file{
path => ["C:\Program Files\Apache Software Foundation\Tomcat 7.0\logs\XXX.log","C:\Program Files\Apache Software Foundation\Tomcat 7.0\logs\XXX.log"]
start_position => beginning
}
}
filter {
grok {
match => {"message" => "%{TIMESTAMP_ISO8601:logdate} [%{DATA:thread}] (%{DATA:classname}) %{LOGLEVEL:level} - %{GREEDYDATA:log_message}"}
}
}
output {
kafka {
broker_list => "XXX:9092"
topic_id => "XXX"
client_id => "XXX"
}
}

Is there a plugin or configuration to fix that?

Thanks,
Amir

Providing more info:
Logs can rotate and change, logstash is locking the log folder which prevent me from actions like upgrading my application (delete\rename log folder).

Thanks,
Amir

I got the same issue. Looking for a solution.

Anantapol