SemanticCacheLookup policy supports non-default Vector Search distance measures

SemanticCacheLookup policy supports non-default Vector Search distance measures

Available in Apigee 1-18-0-apigee-4 and later. A new optional <DistanceMeasureType> element accepts DOT_PRODUCT_DISTANCE (the default, and the existing behavior), COSINE_DISTANCE, SQUARED_L2_DISTANCE and L1_DISTANCE. The policy now compares <Threshold> in the direction the declared measure implies, so declaring a non-default measure requires re-tuning the threshold in the same edit. The 0-to-1 restriction on <Threshold> is also removed.