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Update knn-index.md (#4732) 

Signed-off-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
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@ -48,7 +48,7 @@ However, if you intend to just use painless scripting or a k-NN score script, yo
}
```
### Lucene byte vector
### Lucene byte vector
By default, k-NN vectors are `float` vectors, where each dimension is 4 bytes. If you want to save storage space, you can use `byte` vectors with the `lucene` engine. In a `byte` vector, each dimension is a signed 8-bit integer in the [-128, 127] range.