EsSparkSQL.saveToEs join type(urgent)

I want to import a sub-document of join type, but the official document does not give an example. The sub-document needs to set name and parame and specify roting.
"my_join_field": {
"name": "answer",
"parent": "1"
How to set these two parameters?
Can you give an example of EsSparkSQL. saveToEs?

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