Addresses a number of defects from code review.

Fixes included fixing a typo.
Removing an unused function.
Removing a lingering BREAKPOINT.
Apply changes to sindexes in parallel.

When a change is made that requires updates to the sindexes it spawns a
coro per sindex rather than doing them in serial.

This maybe can blow the coro counter, I haven't done a lot to mitigate
that.