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DOCS-2652 reword definition of exists operator #1599

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DOCS-2652 reword definition of exists operator #1599

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16 changes: 5 additions & 11 deletions source/reference/operator/query/exists.txt
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Expand Up @@ -11,17 +11,11 @@ Definition

*Syntax*: ``{ field: { $exists: <boolean> } }``

:query:`$exists` selects the documents that contain the field if
``<boolean>`` is ``true``. If ``<boolean>`` is ``false``, the query
only returns the documents that do not contain the
field. :query:`$exists` **does** match documents that contain
the field that stores the ``null`` value.

When you specify ``true`` to the :query:`$exists` operator, the
query will select documents where the value of the specified field
is ``null``. If you specify ``false`` to :query:`$exists`, the
query will **not** match fields that hold the ``null`` value.

When ``<boolean>`` is true, :query:`$exists` matches the documents that
contain the field, including documents where the field value is
``null``. If ``<boolean>`` is false, the query returns only the
documents that do not contain the field.

MongoDB `$exists` does **not** correspond to SQL operator
``exists``. For SQL ``exists``, refer to the :query:`$in`
operator.
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