Get data primary key


I am handling how to find the primary key of data in ES index. I know that ES has _id to represent each document's unique id, but the problem is that when I handling the data which has been stored in ES, the data may be exported from RDB like MySQL. How can I get the primary key in this situation?

Any help will be appreciated!

Elasticsearch does not have a concept of primary key. The only thing that uniquely identifies a document is the index together with the id. I would recommend setting the document id to the primary key when indexing from a relational database.

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