FetchFileTransfer erroneously alters Destination Directory when performing COMPLETION_STRATEGY

Scenario:

NiFi running on windows

1. FetchSFTP processor reads files from a remote SFTP server (ok)
2. FetchSFTP then is configured to perform a "completion strategy" of moving the fetched files to another remote directory (fails)

It was found that FetchSFTP (who extends FetchFileTransfer) alters the property "Move Destination Directory" 

Example: 

• Source Remote file:                    /sftp/file1.txt
• Move Destination Directory:      /sftp/done
• Intended file after move:           /sftp/done/file1.txt
• After execution, is is found that FetchSFTP sent the SFTP command to rename the file to: C:\sftp\done\file1.txt, so the SFTP server rejects the operation. The correct path to send is: /sftp/done/file1.txt

Error appears to be in the following code:

• Class: org.apache.nifi.processors.standard.FetchFileTransfer
• method: performCompletionStrategy
• Line: transfer.rename(flowFile, filename, targetFile.getAbsolutePath());
  • Correct method to call appears to be targetFile.getPath()