Update a document(s) in this collection.

        **DEPRECATED** - Use :meth:`replace_one`, :meth:`update_one`, or
        :meth:`update_many` instead.

        .. versionchanged:: 3.0
           Removed the `safe` parameter. Pass ``w=0`` for unacknowledged write
           operations.

def update(self, spec, document, upsert=False, manipulate=False,
               multi=False, check_keys=True, **kwargs):
        """Update a document(s) in this collection.

        **DEPRECATED** - Use :meth:`replace_one`, :meth:`update_one`, or
        :meth:`update_many` instead.

        .. versionchanged:: 3.0
           Removed the `safe` parameter. Pass ``w=0`` for unacknowledged write
           operations.
        """
        warnings.warn("update is deprecated. Use replace_one, update_one or "
                      "update_many instead.", DeprecationWarning, stacklevel=2)
        common.validate_is_mapping("spec", spec)
        common.validate_is_mapping("document", document)
        if document:
            # If a top level key begins with '$' this is a modify operation
            # and we should skip key validation. It doesn't matter which key
            # we check here. Passing a document with a mix of top level keys
            # starting with and without a '$' is invalid and the server will
            # raise an appropriate exception.
            first = next(iter(document))
            if first.startswith('$'):
                check_keys = False

        write_concern = None
        collation = validate_collation_or_none(kwargs.pop('collation', None))
        if kwargs:
            write_concern = WriteConcern(**kwargs)
        with self._socket_for_writes() as sock_info:
            return self._update(sock_info, spec, document, upsert,
                                check_keys, multi, manipulate, write_concern,
                                collation=collation)