Switch to Testcontainers for Elasticsearch examples.

See #636

elasticsearch/example/src/main/resources/application.properties

@@ -1 +0,0 @@
-#spring.elasticsearch.rest.uris=http://localhost:9200

elasticsearch/example/src/main/resources/log4j2.xml

@@ -0,0 +1,12 @@
+<Configuration status="INFO">
+    <Appenders>
+        <Console name="LogToConsole" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="LogToConsole"/>
+        </Root>
+    </Loggers>
+</Configuration>

elasticsearch/example/src/test/java/example/springdata/elasticsearch/conference/ElasticsearchOperationsTest.java

@@ -17,8 +17,6 @@ package example.springdata.elasticsearch.conference;
 
 import static org.assertj.core.api.Assertions.*;
 
-import example.springdata.elasticsearch.util.EnabledOnElasticsearch;
-
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 
@@ -27,12 +25,17 @@ import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
-import org.springframework.data.elasticsearch.core.SearchHit;
-import org.springframework.data.elasticsearch.core.SearchHits;
 import org.springframework.data.elasticsearch.core.geo.GeoPoint;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.query.Criteria;
 import org.springframework.data.elasticsearch.core.query.CriteriaQuery;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+
+import org.testcontainers.elasticsearch.ElasticsearchContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
 
 /**
  * Test case to show Spring Data Elasticsearch functionality.
@@ -43,13 +46,25 @@ import org.springframework.data.elasticsearch.core.query.CriteriaQuery;
  * @author Prakhar Gupta
  */
 @SpringBootTest(classes = ApplicationConfiguration.class)
-@EnabledOnElasticsearch
+@Testcontainers
 class ElasticsearchOperationsTest {
 
 	private static final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
 
-	@Autowired
-	ElasticsearchOperations operations;
+	@Container //
+	private static ElasticsearchContainer container = new ElasticsearchContainer(
+			DockerImageName.parse("docker.elastic.co/elasticsearch/elasticsearch:7.17.2")) //
+					.withPassword("foobar") //
+					.withReuse(true);
+
+	@DynamicPropertySource
+	static void setProperties(DynamicPropertyRegistry registry) {
+		registry.add("spring.elasticsearch.uris", () -> "http://" + container.getHttpHostAddress());
+		registry.add("spring.elasticsearch.username", () -> "elastic");
+		registry.add("spring.elasticsearch.password", () -> "foobar");
+	}
+
+	@Autowired ElasticsearchOperations operations;
 
 	@Test
 	void textSearch() throws ParseException {