reta commented on code in PR #105:
URL: 
https://github.com/apache/flink-connector-elasticsearch/pull/105#discussion_r1621068383


##########
flink-connector-elasticsearch8/src/test/java/org/apache/flink/connector/elasticsearch/sink/ElasticsearchSinkBaseITCase.java:
##########
@@ -21,86 +21,144 @@
 
 package org.apache.flink.connector.elasticsearch.sink;
 
+import org.apache.flink.connector.base.sink.writer.ElementConverter;
+import org.apache.flink.testutils.junit.extensions.parameterized.Parameter;
+import 
org.apache.flink.testutils.junit.extensions.parameterized.ParameterizedTestExtension;
+import org.apache.flink.testutils.junit.extensions.parameterized.Parameters;
+
+import co.elastic.clients.elasticsearch.core.bulk.BulkOperationVariant;
+import co.elastic.clients.elasticsearch.core.bulk.IndexOperation;
 import org.apache.http.HttpHost;
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.UsernamePasswordCredentials;
+import org.apache.http.client.CredentialsProvider;
+import org.apache.http.impl.client.BasicCredentialsProvider;
 import org.apache.http.util.EntityUtils;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.Response;
 import org.elasticsearch.client.RestClient;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.TestTemplate;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.testcontainers.containers.output.Slf4jLogConsumer;
+import org.testcontainers.containers.wait.strategy.LogMessageWaitStrategy;
 import org.testcontainers.containers.wait.strategy.Wait;
 import org.testcontainers.elasticsearch.ElasticsearchContainer;
-import org.testcontainers.junit.jupiter.Container;
-import org.testcontainers.junit.jupiter.Testcontainers;
 import org.testcontainers.utility.DockerImageName;
 
 import java.io.IOException;
 import java.time.Duration;
+import java.util.Arrays;
+import java.util.List;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-/** Base Integration tests class. */
-@Testcontainers
-public class ElasticsearchSinkBaseITCase {
+/**
+ * {@link ElasticsearchSinkBaseITCase} is the base class for integration tests.
+ *
+ * <p>It is extended with the {@link ParameterizedTestExtension} for 
parameterized testing against
+ * secure and non-secure Elasticsearch clusters. Tests must be annotated by 
{@link TestTemplate} in
+ * order to be parameterized.
+ *
+ * <p>The cluster is running via test containers. In order to reuse the 
singleton containers by all
+ * inheriting test classes, we manage their lifecycle. The two containers are 
started only once when
+ * this class is loaded. At the end of the test suite the Ryuk container that 
is started by
+ * Testcontainers core will take care of stopping the singleton container.
+ */
+@ExtendWith(ParameterizedTestExtension.class)

Review Comment:
   Thank you, @liuml07 !



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