[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 ## 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. 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.