R1:88798354e8c9

Soften a possible cluster search setup fatal

Summary:
Ref T12450. The way that config repair and setup issues interact is kind of complicated, and if `cluster.search` is invalid we may end up using `cluster.search` before we repair it.

I poked at things for a bit but wasn't confident I could get it to consistently repair before we use it without doing a big messy change.

The only thing that really matters is whether "type" is valid or not, so just put a slightly softer/more-tailored check in for that.