Search: use record estimates for pricing while indexing is in process

Probably all needs to be fixed on the API side, but tracking it here for now.

"I wonder if it would be a good idea (and even possible?) for the current_records() method to just return the results of estimate_records() while the initial site indexing is still in the process of happening?"

We really need a flag/status like this for other cases where indexing is still happening.

Start by locating the API implementations of current_records() and estimate_records(), then trace how initial site indexing is represented. Determine how pricing should use estimates during indexing and how an indexing status or flag could support other cases. Done means the behavior and status semantics are defined for the initial indexing period.

Written by the indexing model from the issue text.