Thank you for using Rekognition. IndexFaces/SearchFaces/SearchFacesByImage API will be tied to Rekognition Collection's version, that is saying if you created a collection A in FaceModelVersion 4, any indexFace operation toward this collection A will be on FaceModelVersion 4 no matter what the latest FaceModelVersion is. New collections created through CreateCollection will be using the latest face model version.
Reindexing all the images/faces to a new collection with the latest face model version is optional. Customer could choose to create a new collection and reindex the images when customer wants the latest face model experience.
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