[Uptime] Auto-generated index pattern doesn't work with discover

[andrewvc]

I did some digging, we only use the index pattern data for the Kuery Bar, but nothing about it requires it to be an actual index pattern saved object. We should instead just directly serve the JSON from a REST endpoint as a file based resource since it's shipped with Kibana. We never really needed to use saved objects here in the first place.

Original comment below
Uptime automatically creates an index pattern named UptimeIndexPattern in Kibana. Unfortunately this pattern doesn't work with the explore tool, though it seems to work fine for the internal purposes for which it is intended. This is confusing for users. There is probably some internal field that can be fixed here.

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[justinkambic]

@andrewvc should this say "doesn't work with Discover"?

[andrewvc]

Yes, my mistake

[DanRoscigno]

Does not work with Lens either :(