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1000 descriptors are too few.
I have tried both BF and LSH with about 1.000.000 descriptors and time were something like:

BruteForce: 50sec (knnMatch)
LSH: 2sec         (knnMatch)

1000 descriptors are too few.
I have tried both BF and LSH with about 1.000.000 descriptors and time were something like:

BruteForce: 50sec (knnMatch)
LSH: 2sec         (knnMatch)

1000 descriptors are too few.
I have tried both BF and LSH with about 1.000.000 1'000'000 descriptors and time were something like:

BruteForce: 50sec (knnMatch)
LSH: 2sec         (knnMatch)

I have tuned a bit the LSH param to get that speed, anyway with default param and 1mil descriptors the knnMatch took 4 sec