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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