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This page documents the mongo shell method, and does
not refer to the MongoDB Node.js driver (or any other driver)
method. For corresponding MongoDB driver API, refer to your specific
MongoDB driver documentation instead.
cursor.isClosed() returns true if the server has
closed the cursor.
A closed cursor may still have documents remaining in the last
received batch. Use cursor.isExhausted() or
cursor.hasNext() to check if the cursor is fully