which field to get the productId from context
product service
injected logger used to handle the logging
request context [headers, body, params, query].
200 Status Ok
This validator is used to check if the product is exist by applying the following steps in sequence:
Get the productId from the context
Check if the productId is null
Check if the product is exist
400 NBError Wrong parameter
404 NBError Not found
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Is product exist validator