how to create index/primary key in aws glue?

I have a json file in s3 (sample below) in json lines format. I create a crawler in aws glue to read this file, which creates a table definition and produces a table schema as such ,

schema:

#        column_name     Data type

1        product_code         String
2.        name                      String

I plan to read this schema and data via a script , something like this, read the catalog into a spark dataframe and write that dataframe to RDS (postgresql) .

when writing to RDS , is there a setting that i can set , such that it will generate primary key (auto incrementing) and write to the database. or if i can generate a key , while crawler creates the schema and then write it to database , that would also work.

any suggestions? some working examples would help

schema = glueContext.create_dynamic_frame.from_catalog(database='product-catalog' ...) 

spark_dataframe = schema.toDF()

#write to RDS 
spark_dataframe.write.format("jdbc").option 

{"product_code" : "electornics" , "name": "TV" , ...}
{"product_code": "Kitchen" , "name" : "oven" , ....}