support fuzzy sentence search via text embedding

[ghost]

Which SIST2 component is your Feature Request related to? index

Is your feature request related to a problem? Please describe.

What would you like to see happen? support fuzzy sentence (ChatGPT-like) search via text embedding

Additional context The all-MiniLM-L6-v2 model provides cross-language embedding for sentence similarity.

Also see #460.