Include sharding key if it is available in the document

[pitagoras3]

What?

If destination collection is sharded, and Mongo Change Event has sharding key value, then place it in the documentKey used for upsert operation.

Why?

Because without this we're getting error:

Failed to update document's shard key field. There is either an orphan for this document or _id for this collection is not globally unique. :: caused by :: During insert stage of updating a shard key :: caused by :: E11000 duplicate key error collection