Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/834
Ok I got it to a point where it can be run multiple times on an
already-encrypted file and the only side-effect is that previously encrypted
properties will look like (after 2 executions):
```
nifi.sensitive.props.key=C7AlglOx5QOmggfM||EG+qM9ubldyr8J73RmXCyWIxRKCzn6JyXv7mN6DkV51oDoRSdnWWXbALfKcKFw
nifi.sensitive.props.key.protected=aes/gcm/256
nifi.sensitive.props.key.protected=aes/gcm/256
```
Fixing that and then will push.
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