Always set total hits to null when track total hits is false #36285
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This change ensures that shards don't set the total hits to an approximate value when the total number of hits is not tracked (track_total_hits is false). This is required to ensure that a node in 7 don't send an approximate total hits to a node in 6x. We have an assertion in the total hits serialization code that checks this and this caused some random failures during the bwc tests.
Closes #36284