Currently if you index 386,000 records at 10,000 at a time
- default cron at every 5 mins takes 195 mins (3.25 hours)
- cron set to every minute should take 39 mins (but if indexing not
  finished the following minute may be skipped)

With fast_index.php it starts next index straight after last finishes
so runs thru at optimal speed
- took only 25 minutes (almost 66% faster than per minute cron and way
faster than default cron speed)

behatnotneeded

Change-Id: I65bfb19ab6481a95bafb120d3139d37e0ef28f92
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>