Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/2841
Some were simply suppressed with an annotation if they were in a test class
that specifically covered a deprecated class. The `NiFiLegacyCipherProvider` is
an example. Some deprecated methods were switched to their follow-on methods,
like `IOUtils.toString(Object)` to `IOUtils.toString(Object, Charset)`. The
`StringEncryptor.createEncryptor()` switch is the only one that stands out to
me as having logic changed, so that may be a good place to examine.
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