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Queries like script_score wrap a query and modify its score. If the inner query rewrites to match_none, then the entire query can rewrite to match_none. This lets us detect that certain shards can be skipped during the 'can match' phase. This was a simple change that seemed like it would help in some cases. But it will likely not have a huge impact, since in many use cases where the 'can match' phase is helpful, the search is not sorted by score.