flink-connector-elasticsearch-base/src/main/java/org/apache/flink/connector/elasticsearch/table/ElasticsearchConnectorOptions.java [53:70]:
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    public static final ConfigOption<String> PASSWORD_OPTION =
            ConfigOptions.key("password")
                    .stringType()
                    .noDefaultValue()
                    .withDescription("Password used to connect to Elasticsearch instance.");

    public static final ConfigOption<String> USERNAME_OPTION =
            ConfigOptions.key("username")
                    .stringType()
                    .noDefaultValue()
                    .withDescription("Username used to connect to Elasticsearch instance.");

    public static final ConfigOption<String> KEY_DELIMITER_OPTION =
            ConfigOptions.key("document-id.key-delimiter")
                    .stringType()
                    .defaultValue("_")
                    .withDescription(
                            "Delimiter for composite keys e.g., \"$\" would result in IDs \"KEY1$KEY2$KEY3\".");
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flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/table/ElasticsearchConnectorOptions.java [61:78]:
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    public static final ConfigOption<String> PASSWORD_OPTION =
            ConfigOptions.key("password")
                    .stringType()
                    .noDefaultValue()
                    .withDescription("Password used to connect to Elasticsearch instance.");

    public static final ConfigOption<String> USERNAME_OPTION =
            ConfigOptions.key("username")
                    .stringType()
                    .noDefaultValue()
                    .withDescription("Username used to connect to Elasticsearch instance.");

    public static final ConfigOption<String> KEY_DELIMITER_OPTION =
            ConfigOptions.key("document-id.key-delimiter")
                    .stringType()
                    .defaultValue("_")
                    .withDescription(
                            "Delimiter for composite keys e.g., \"$\" would result in IDs \"KEY1$KEY2$KEY3\".");
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