TSDB: improve error message for nested fields #83837
Merged
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Nested fields have never been supported in time_series mode but their
error message was something along the lines of "nested fields don't work
when you've enabled index sorting". Which is true, but when you put
an index into time_series mode you don't explicitly enable index sorting
gives you a more explicit "nested fields don't work in time_series
mode".
I've also added tests for nested dimensions outside of time series mode.
We didn't have any such tests and it's nice to assert how they currently
work.