Deprecate Cursor.open().

This method should not be called from code consuming the Cursor.

See: #1575
Original Pull Request: #2014

src/main/java/org/springframework/data/redis/core/Cursor.java

@@ -43,10 +43,13 @@ public interface Cursor<T> extends BoundedIterator<T>, CloseableIterator<T> {
 	boolean isClosed();
 
 	/**
-	 * Opens cursor and returns itself.
+	 * Opens cursor and returns itself. This method is intended to be called by components constructing a {@link Cursor}
+	 * and should not be called externally.
 	 *
 	 * @return the opened cursor.
+	 * @deprecated to be removed from the interface in the next major version.
 	 */
+	@Deprecated
 	Cursor<T> open();
 
 	/**