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Update knn-search.asciidoc #106809

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Update knn-search.asciidoc #106809

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2 changes: 1 addition & 1 deletion docs/reference/how-to/knn-search.asciidoc
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Expand Up @@ -66,7 +66,7 @@ least enough RAM to hold the vector data and index structures. To check the
size of the vector data, you can use the <<indices-disk-usage>> API. As a
loose rule of thumb, and assuming the default HNSW options, the bytes used will
be `num_vectors * 4 * (num_dimensions + 12)`. When using the `byte` <<dense-vector-element-type,`element_type`>>
the space required will be closer to `num_vectors * (num_dimensions + 12)`. Note that
the space required will be closer to `num_vectors * (num_dimensions + 48)`. Note that
the required RAM is for the filesystem cache, which is separate from the Java
heap.

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