flink-connector-elasticsearch-base/src/main/java/org/apache/flink/connector/elasticsearch/table/ElasticsearchConnectorOptions.java [40:51]:
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    public static final ConfigOption<List<String>> HOSTS_OPTION =
            ConfigOptions.key("hosts")
                    .stringType()
                    .asList()
                    .noDefaultValue()
                    .withDescription("Elasticsearch hosts to connect to.");

    public static final ConfigOption<String> INDEX_OPTION =
            ConfigOptions.key("index")
                    .stringType()
                    .noDefaultValue()
                    .withDescription("Elasticsearch index for every record.");
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flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/table/ElasticsearchConnectorOptions.java [42:53]:
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    public static final ConfigOption<List<String>> HOSTS_OPTION =
            ConfigOptions.key("hosts")
                    .stringType()
                    .asList()
                    .noDefaultValue()
                    .withDescription("Elasticsearch hosts to connect to.");

    public static final ConfigOption<String> INDEX_OPTION =
            ConfigOptions.key("index")
                    .stringType()
                    .noDefaultValue()
                    .withDescription("Elasticsearch index for every record.");
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