Add support for the $sigmoid expression. This expression is basically syntactic sugar for
{$divide: [ 1, {$add: [1, {$exp: {$multiply: [-1, <input>]}} ]}}
which can be used by users to normalize some values.
This was split from DRIVERS-3090 to separate the work for this and adding support for the $rankFusion stage.
- is related to
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CSHARP-5478 Support $rankFusion stage
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- Closed
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