types of
searches possible using this function: exact search, which simply looks
for exact string matches for a given query against the vector dataset;
keyword search, which breaks vector metadata into unigram tokens and
then tries to find the vectors with the greatest number of unique
matches; and, semantic search which works better with search phrases and
has tolerance for inexact searches. Switching between search modes is
done using the <code>query_type</code> argument when calling
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