public KafkaSourceBuilder<OUT> setBootstrapServers(String bootstrapServers) {
        return setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
    }
Sets the bootstrap servers for the KafkaConsumer of the KafkaSource.

@param bootstrapServers the bootstrap servers of the Kafka cluster.
@return this KafkaSourceBuilder.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/kafka/src/main/java/org/apache/inlong/sort/kafka/source/KafkaSourceBuilder.java