How to pass a dynamic path while writing to files using writeFileAsText(path)?

[HarshithBolar <hk...@arity.com>]

Let's say I have a Stream with elements of type `String`. I want to write
each element in the stream to a separate file in some folder. I'm using the
following set up.

    > filteredStream.writeAsText(path).setParallelism(1);

How do I make this path variable? I even tried adding `System.nanotime()` to
the path to make it variable. But it still doesn't seem to work, everything
gets written to a single file. 




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