TST: Rename indices fixture #32974
Description
Following up on #28865 (comment) by @simonjayhawkins we should discuss if we want to rename the indices fixture.
A singular name seems more reasonable to its use cases. The most obvious contender is index.
Does any1 have objections?
EDIT: In another comment jreback suggested to use index_fixture instead to make things more obvious. I agree that it would be a better fit