flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/table/KafkaDynamicTableFactory.java [122:130]:
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    @Override
    public String factoryIdentifier() {
        return IDENTIFIER;
    }

    @Override
    public Set<ConfigOption<?>> requiredOptions() {
        final Set<ConfigOption<?>> options = new HashSet<>();
        options.add(PROPS_BOOTSTRAP_SERVERS);
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flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/table/UpsertKafkaDynamicTableFactory.java [91:99]:
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    @Override
    public String factoryIdentifier() {
        return IDENTIFIER;
    }

    @Override
    public Set<ConfigOption<?>> requiredOptions() {
        final Set<ConfigOption<?>> options = new HashSet<>();
        options.add(PROPS_BOOTSTRAP_SERVERS);
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