in flink-connector-gcp-pubsub/src/main/java/org/apache/flink/streaming/connectors/gcp/pubsub/PubSubSink.java [320:323]
public <IN> ProjectNameBuilder<IN> withSerializationSchema(
SerializationSchema<IN> deserializationSchema) {
return new PubSubSinkBuilder<>(deserializationSchema);
}