[skip ci]Update retrieve_entity.md (#11385)

Signed-off-by: ruiyi.jiang <ruiyi.jiang@zilliz.com>
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ryjiang 2021-11-08 09:31:17 +08:00 committed by GitHub
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## Background
Milvus supports one entity containing multiple vector fields and multiple scalar fields.
In Milvus, one entity encapsulates multiple vectors and scalars.
When creating a collection, you can specify using the primary key generated automatically or the user-provided primary key. If the user sets to use the user-provided primary key, each entity inserted must contain the primary key field, otherwise, the insertion will fail. The primary keys will be returned after the insertion request is successful.