race: stop stale sweeper before iterating over factories

Author: yaauie

lib/logstash/outputs/s3.rb

@@ -266,6 +266,8 @@ def close
 
     @logger.debug("Uploading current workspace")
 
+    @file_repository.shutdown # stop stale sweeps
+
     # The plugin has stopped receiving new events, but we still have
     # data on disk, lets make sure it get to S3.
     # If Logstash get interrupted, the `restore_from_crash` (when set to true) method will pickup
@@ -275,8 +277,6 @@ def close
       upload_file(file)
     end
 
-    @file_repository.shutdown
-
     @uploader.stop # wait until all the current upload are complete
     @crash_uploader.stop if @restore # we might have still work to do for recovery so wait until we are done
   end