in modules/harness-build-flex-template/pubsub_dataflow_bigquery/pubsub_transform_bigquery.py [0:0]
def transform_data(message):
"""
The "message" input is a json object representing the data
read from the Pub/Sub subscription or topic.
Replace this code example with your own data transformation.
"""
message['Issue_Date'] = message['Issue_Date'].replace("/", "-")
return message