public MongoDBSourceBuilder<T> username(String username) {
        this.configFactory.username(username);
        return this;
    }
Name of the database user to be used when connecting to MongoDB.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/mongodb-cdc/src/main/java/org/apache/inlong/sort/mongodb/source/MongoDBSourceBuilder.java