Appflow_flow docs incomplete

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/appflow_flow

Description

I’m having trouble finding the correct values to filter fields that are not null. Here’s the code I’m using

task{
task_type= “Validate”

conector_operator{
salesforce=“VALIDATE_NOT_NULL”
}

source_fields = [“Title”]

task_properties = {
VALIDATION_ACTION = ¿? what values fit in here
}
}

can you help me with this code?