public async Task GetByAgeAsync()
        {
            await RemoveDataAsync();

            var employee19 = await _repository.AddAsync(EmployeeGenerator.Generate(age: 19));

            var employee20 = await _repository.AddAsync(EmployeeGenerator.Generate(age: 20));

            await _client.RefreshAsync();

            var result = await _repository.GetByAgeAsync(employee19.Age);

            Assert.Equal(employee19.ToJson(), result.ToJson());

            var results = await _repository.GetAllByAgeAsync(employee20.Age);

            Assert.Equal(1, results.Total);
            Assert.Equal(employee20.ToJson(), results.Documents.First().ToJson());
        }