Have you considered collection aliasing? You can create an alias that
points to multiple collections. So you could keep specific collections
and have aliases that encompass your regions....

The one caveat here is that sorting the final result set by score will
require that the collections be roughly similar in terms of TF/IDF.

Best,
Erick

On Mon, Nov 13, 2017 at 11:33 AM, Shamik Bandopadhyay <[EMAIL PROTECTED]> wrote:
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