Fix ord-to-doc mapping when searching Lucene 9.0.0 hnsw indices #13947
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Bug discovered in #13910
This corrects the logic so that users in lucene 9.12.1 will be able to correctly read from Lucene 9.0.0 HNSW indices. Previously, if they created an index in lucene 9.0.0 and not all documents contained a vector, reading in 9.8+ would produce non-sensical scores.