Which is more efficient

[Antony Bowesman]

Just wondered which was more efficient under the hood

 for (int i = 0; i < size; i++)
     terms[i] = new Term("id", doc_key[i]);

This

 writer.deleteDocuments(terms);
 for (int i = 0; i < size; i++)
     writer.addDocument(doc[i]);

Or this

 for (int i = 0; i < size; i++)
     writer.updateDocument(terms[i], doc[i]);


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