Bug: Bad Warning in Builders

[shyamd]

MapBuilder, GroupBuilder, and ProjectionBuilder all have this ensure index warning that is not a good description of what actually went "wrong". It basically warns that one double index is missing when in fact the check is for all relevant indexes: key, last_updated and state; these are also not double indexes. Would be good to update the warning. Here is the linked code:

maggma/src/maggma/builders/map_builder.py

Lines 79 to 86 in 672c6ae

	if not all(index_checks):
	self.logger.warning(
	"Missing one or more important indices on stores. "
	"Performance for large stores may be severely degraded. "
	"Ensure indices on target.key and "
	"[(store.last_updated_field, -1), (store.key, 1)] "
	"for each of source and target."
	)