public async Task ThenWillDeleteIndicesOlderThanGivenDaysOld()
        {
            //Arrange
            const uint daysOld = 2;

            //Act
            await _repository.DeleteIndices(daysOld);

            //Assert
            _registryMock.Verify(r => r.DeleteOldIndices(daysOld), Times.Once);
        }