Handle null values in date range

Hello,
I'm using elasticseach .net, I was wondering is it possible to handle null values in date range?

            .Query(q => q
                    .FunctionScore(fs => fs.Query(qy => qy
                    .Bool(b => b
                        .Must(m => m
                            .Term(tm => tm.Field(fd => fd.Client)
                                .Value(subscription.Code)
                            )
                            ,
                            m => m.
                            Terms(tm => tm.Field(fd => fd.Info)
                                    .Terms(categories)
                            ),
                            m => m.
                            DateRange(f => f.Field(fd => fd.ExpiryDate).GreaterThanOrEquals(DomainTime.Now()))
                        )
     )
    )

Thank you in advance:)

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