You're right, but the point here is that positional queries are boolean queries plus positions. For example, document that match 'a NEAR b' are a subset of documents matching 'a AND b'. So if 'a AND b' has no matches, there is no need to execute the more expensive 'a NEAR b'.
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[ 2.7 ms ] story [ 17.4 ms ] threadIntuitively it feels like the reverse would be true.