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EXISTS field specifier (case sensitive) allows you to find documents that contain a specified field even if this field contains no value.
Note: You can optimize the field specifier speed by restricting the field to the
||One or more fields. A document returns only if it contains one of these fields (even if the field is empty). Separate multiple fields with colons (
A document must contain an ID field to return.
A document must contain an
NAME field (or both) to return.