NIFI-11524 Documentation and config experience improvement for ExecuteStreamCommand

[nandorsoma]

Summary

NIFI-11524

This PR indends to add documentation for the ExecuteSteamCommand processor and improves the configuration experience by adding dependency between properties.

I've noticed that the processor adds every Dynamic Property as environment variable even when it is a command argument. I didn't change this behavior because it might introduce a breaking change, but I'd change this behavior in a separate 2.0 only PR. Simply adding another regex check there would introduce the 4. regex check which is quite ugly so it would be a good opportunity for refactor. Another option would be to add validation for environment variables to ensure they don't contain . character, because most shells don't support it. But I'm not sure about that because there are commands that can utilize such env variables even though they are not common.

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  • JDK 11
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[exceptionfactory]

Thanks for the additional documentation and improvements @nandorsoma! I just noted a couple very minor things, otherwise this should be ready to go.

[nandorsoma]

Thank you for your review @exceptionfactory! Please see my latest commit where I applied your suggestions.

[exceptionfactory]

Thanks for making the adjustments @nandorsoma, the latest version looks good! +1 merging