Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/2365
@joewitt Looks like the previous implementation using a `com.sun` class
used two space indentation. Primarily investigation suggests a few options...
- Accept a new default of 4 spaces.
- Set a property which configures an internal indentation strategy
`marshaller.setProperty("com.sun.xml.internal.bind.indentString", " ");`
- Add a dependency on the BSD licensed stax-utils
```
<dependency>
<groupId>net.java.dev.stax-utils</groupId>
<artifactId>stax-utils</artifactId>
<version>20070216</version>
</dependency>
```
which offers a similar (same?) `com.sun` class that we were previously
referencing.
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