[8.x] Set default similarity for Cohere model to cosine (#125370) #125427
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Cohere embeddings are expected to be normalized to unit vectors, but due to floating point precision issues,
our check ({@link DenseVectorFieldMapper#isNotUnitVector(float)}) often fails.
This change fixes this bug by setting the default similarity for newly created Cohere inference endpoint to cosine.
Closes elastic#122878
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Backport of #125370 to 8.x