Fix FutureReturnValueIgnored violations in direct runner
Open
bug
direct
P3
runners
- Dominant language
- Java
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Description
The direct runner has many ErrorProne violations of [FutureReturnValueIgnored](http://errorprone.info/bugpattern/FutureReturnValueIgnored) which seem like legitimate areas where we are potentially ignoring exceptions from asynchronous work. Solving these will require API changes in various places to block on asyc work or pass a `Future` back to the caller.
Imported from Jira [BEAM-4563](https://issues.apache.org/jira/browse/BEAM-4563). Original Jira may contain additional context.
Reported by: swegner.
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