Added an example. It cannot due to how the executor service works. Here's an
example of what's in the log for the exception swallowing test:
```
2018-08-29T17:35:32,341 ERROR [test-fjp-1] io.druid.guice.ForkJoinPoolProvider
- Unhandled exception in thread [Thread[test-fjp-1,5,main]]
java.lang.RuntimeException: test exception
at
io.druid.guice.ForkJoinPoolProviderTest.testThreadSwallowsException(ForkJoinPoolProviderTest.java:55)
~[test-classes/:?]
```
[ Full content available at:
https://github.com/apache/incubator-druid/pull/5913 ]
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