Indexation is the linking of state pensions with earnings (rather than with inflation for example) so it ensures that the state pension will gradually increase over time in line with earnings. Ad astra per aspera
By linking with non-indexed wages, isn't it making a demand for the link with average earnings to be restored?
The UK state pension used to be linked to average earnings, but that was stopped by the Thatcher government, who tied it to inflation (usually lower) instead. Hence the erosion in real terms of the amount of the basic pension.