After working through this with david - decided on changing this into a boost (not a penalty) as then the relavency score for older documents will get lowered as the boot value is multiplied.
After working through this with david - decided on changing this into a
boost (not a penalty) as then the relavency score for older documents
will get lowered as the boot value is multiplied.

The result is that we can then revert the boost values on inside gov
formats

We tweaked the values of the curve so the maximum boost will be 2 (for
documents published right now). And generated a new graph in days so
it's actually readable.

alphagov/rummager,theodi/rummager,alphagov/rummager,theodi/rummager