protected static void AssertIsTermFilter(FilterContainer filter1, FilterContainer filter2)
        {
            filter1.Should().NotBeNull();
            filter2.Should().NotBeNull();

            IFilterContainer f1 = filter1;
            IFilterContainer f2 = filter2;

            f1.Should().NotBeNull();
            f2.Should().NotBeNull();
            f1.Term.Should().NotBeNull();
            f2.Term.Should().NotBeNull();

            f1.Term.Field.Should().Be(f2.Term.Field);
            f1.Term.Value.Should().Be(f2.Term.Value);
        }