Merge pull request #28496 from filiphr

* gh-28496:
  Polish "Bring back Elasticsearch RestClient auto-configuration"
  Bring back Elasticsearch RestClient auto-configuration

Closes gh-28496

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticSearchRestHealthContributorAutoConfiguration.java

@@ -39,18 +39,16 @@
  * @author Artsiom Yudovin
  * @since 2.1.1
  */
-@SuppressWarnings("deprecation")
 @AutoConfiguration(after = ElasticsearchRestClientAutoConfiguration.class)
-@ConditionalOnClass(org.elasticsearch.client.RestHighLevelClient.class)
-@ConditionalOnBean(org.elasticsearch.client.RestHighLevelClient.class)
+@ConditionalOnClass(RestClient.class)
+@ConditionalOnBean(RestClient.class)
 @ConditionalOnEnabledHealthIndicator("elasticsearch")
-public class ElasticSearchRestHealthContributorAutoConfiguration extends
-		CompositeHealthContributorConfiguration<ElasticsearchRestHealthIndicator, org.elasticsearch.client.RestHighLevelClient> {
+public class ElasticSearchRestHealthContributorAutoConfiguration
+		extends CompositeHealthContributorConfiguration<ElasticsearchRestHealthIndicator, RestClient> {
 
 	@Bean
 	@ConditionalOnMissingBean(name = { "elasticsearchHealthIndicator", "elasticsearchHealthContributor" })
-	public HealthContributor elasticsearchHealthContributor(
-			Map<String, org.elasticsearch.client.RestHighLevelClient> clients) {
+	public HealthContributor elasticsearchHealthContributor(Map<String, RestClient> clients) {
 		return createContributor(clients);
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticSearchRestHealthContributorAutoConfigurationTests.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure.elasticsearch;
+
+import org.elasticsearch.client.RestClient;
+import org.elasticsearch.client.RestClientBuilder;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.actuate.autoconfigure.health.HealthContributorAutoConfiguration;
+import org.springframework.boot.actuate.elasticsearch.ElasticsearchRestHealthIndicator;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration;
+import org.springframework.boot.test.context.FilteredClassLoader;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ElasticSearchRestHealthContributorAutoConfiguration}.
+ *
+ * @author Filip Hrisafov
+ * @author Andy Wilkinson
+ */
+class ElasticSearchRestHealthContributorAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(ElasticsearchRestClientAutoConfiguration.class,
+					ElasticSearchRestHealthContributorAutoConfiguration.class,
+					HealthContributorAutoConfiguration.class));
+
+	@Test
+	void runShouldCreateIndicator() {
+		this.contextRunner.run((context) -> assertThat(context).hasSingleBean(ElasticsearchRestHealthIndicator.class)
+				.hasBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	@SuppressWarnings("deprecation")
+	void runWithoutRestHighLevelClientAndWithoutRestClientShouldNotCreateIndicator() {
+		this.contextRunner
+				.withClassLoader(
+						new FilteredClassLoader(org.elasticsearch.client.RestHighLevelClient.class, RestClient.class))
+				.run((context) -> assertThat(context).doesNotHaveBean(ElasticsearchRestHealthIndicator.class)
+						.doesNotHaveBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	void runWithoutRestHighLevelClientAndWithRestClientShouldCreateIndicator() {
+		this.contextRunner.withUserConfiguration(CustomRestClientConfiguration.class)
+				.run((context) -> assertThat(context).hasSingleBean(ElasticsearchRestHealthIndicator.class)
+						.hasSingleBean(ElasticsearchRestHealthIndicator.class)
+						.hasBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	void runWithRestHighLevelClientAndWithRestClientShouldCreateIndicator() {
+		this.contextRunner.withUserConfiguration(CustomRestHighClientConfiguration.class)
+				.run((context) -> assertThat(context).hasSingleBean(ElasticsearchRestHealthIndicator.class)
+						.hasBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	void runWhenDisabledShouldNotCreateIndicator() {
+		this.contextRunner.withPropertyValues("management.health.elasticsearch.enabled:false")
+				.run((context) -> assertThat(context).doesNotHaveBean(ElasticsearchRestHealthIndicator.class)
+						.doesNotHaveBean("elasticsearchHealthContributor"));
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class CustomRestClientConfiguration {
+
+		@Bean
+		RestClient customRestClient(RestClientBuilder builder) {
+			return builder.build();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@SuppressWarnings("deprecation")
+	static class CustomRestHighClientConfiguration {
+
+		@Bean
+		org.elasticsearch.client.RestHighLevelClient customRestHighClient(RestClientBuilder builder) {
+			return new org.elasticsearch.client.RestHighLevelClient(builder);
+		}
+
+		@Bean
+		RestClient customClient(org.elasticsearch.client.RestHighLevelClient restHighLevelClient) {
+			return restHighLevelClient.getLowLevelClient();
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/elasticsearch/ElasticsearchRestClientAutoConfiguration.java

@@ -22,6 +22,8 @@
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientBuilderConfiguration;
+import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientConfiguration;
+import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientFromRestHighLevelClientConfiguration;
 import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientSnifferConfiguration;
 import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestHighLevelClientConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -40,6 +42,7 @@
 @EnableConfigurationProperties({ ElasticsearchProperties.class, ElasticsearchRestClientProperties.class,
 		DeprecatedElasticsearchRestClientProperties.class })
 @Import({ RestClientBuilderConfiguration.class, RestHighLevelClientConfiguration.class,
+		RestClientFromRestHighLevelClientConfiguration.class, RestClientConfiguration.class,
 		RestClientSnifferConfiguration.class })
 public class ElasticsearchRestClientAutoConfiguration {
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/elasticsearch/ElasticsearchRestClientConfigurations.java

@@ -36,6 +36,7 @@
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.context.annotation.Bean;
@@ -46,6 +47,7 @@
  * Elasticsearch rest client configurations.
  *
  * @author Stephane Nicoll
+ * @author Filip Hrisafov
  */
 class ElasticsearchRestClientConfigurations {
 
@@ -126,16 +128,41 @@ org.elasticsearch.client.RestHighLevelClient elasticsearchRestHighLevelClient(
 
 	@SuppressWarnings("deprecation")
 	@Configuration(proxyBeanMethods = false)
-	@ConditionalOnClass(Sniffer.class)
+	@ConditionalOnClass(org.elasticsearch.client.RestHighLevelClient.class)
 	@ConditionalOnSingleCandidate(org.elasticsearch.client.RestHighLevelClient.class)
+	@ConditionalOnMissingBean(RestClient.class)
+	static class RestClientFromRestHighLevelClientConfiguration {
+
+		@Bean
+		RestClient elasticsearchRestClient(org.elasticsearch.client.RestHighLevelClient restHighLevelClient) {
+			return restHighLevelClient.getLowLevelClient();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnMissingClass("org.elasticsearch.client.RestHighLevelClient")
+	@ConditionalOnMissingBean(RestClient.class)
+	static class RestClientConfiguration {
+
+		@Bean
+		RestClient elasticsearchRestClient(RestClientBuilder restClientBuilder) {
+			return restClientBuilder.build();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnClass(Sniffer.class)
+	@ConditionalOnSingleCandidate(RestClient.class)
 	static class RestClientSnifferConfiguration {
 
 		@Bean
 		@ConditionalOnMissingBean
-		Sniffer elasticsearchSniffer(org.elasticsearch.client.RestHighLevelClient client,
-				ElasticsearchRestClientProperties properties,
+		@SuppressWarnings("deprecation")
+		Sniffer elasticsearchSniffer(RestClient client, ElasticsearchRestClientProperties properties,
 				DeprecatedElasticsearchRestClientProperties deprecatedProperties) {
-			SnifferBuilder builder = Sniffer.builder(client.getLowLevelClient());
+			SnifferBuilder builder = Sniffer.builder(client);
 			PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 			Duration interval = deprecatedProperties.isCustomized() ? deprecatedProperties.getSniffer().getInterval()
 					: properties.getSniffer().getInterval();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/elasticsearch/ElasticsearchRestClientAutoConfigurationIntegrationTests.java

@@ -16,13 +16,19 @@
 
 package org.springframework.boot.autoconfigure.elasticsearch;
 
+import java.io.InputStream;
 import java.time.Duration;
 import java.util.HashMap;
 import java.util.Map;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.elasticsearch.action.get.GetRequest;
 import org.elasticsearch.action.index.IndexRequest;
+import org.elasticsearch.client.Request;
 import org.elasticsearch.client.RequestOptions;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.RestClient;
 import org.junit.jupiter.api.Test;
 import org.testcontainers.elasticsearch.ElasticsearchContainer;
 import org.testcontainers.junit.jupiter.Container;
@@ -40,6 +46,7 @@
  * @author Brian Clozel
  * @author Vedran Pavic
  * @author Evgeniy Cheban
+ * @author Filip Hrisafov
  */
 @Testcontainers(disabledWithoutDocker = true)
 class ElasticsearchRestClientAutoConfigurationIntegrationTests {
@@ -53,7 +60,7 @@ class ElasticsearchRestClientAutoConfigurationIntegrationTests {
 
 	@Test
 	@SuppressWarnings("deprecation")
-	void restClientCanQueryElasticsearchNode() {
+	void restHighLevelClientCanQueryElasticsearchNode() {
 		this.contextRunner
 				.withPropertyValues("spring.elasticsearch.uris=" + elasticsearch.getHttpHostAddress(),
 						"spring.elasticsearch.connection-timeout=120s", "spring.elasticsearch.socket-timeout=120s")
@@ -70,4 +77,23 @@ void restClientCanQueryElasticsearchNode() {
 				});
 	}
 
+	@Test
+	void restClientCanQueryElasticsearchNode() {
+		this.contextRunner
+				.withPropertyValues("spring.elasticsearch.uris=" + elasticsearch.getHttpHostAddress(),
+						"spring.elasticsearch.connection-timeout=120s", "spring.elasticsearch.socket-timeout=120s")
+				.run((context) -> {
+					RestClient client = context.getBean(RestClient.class);
+					Request index = new Request("PUT", "/test/_doc/2");
+					index.setJsonEntity("{" + "  \"a\": \"alpha\"," + "  \"b\": \"bravo\"" + "}");
+					client.performRequest(index);
+					Request getRequest = new Request("GET", "/test/_doc/2");
+					Response response = client.performRequest(getRequest);
+					try (InputStream input = response.getEntity().getContent()) {
+						JsonNode result = new ObjectMapper().readTree(input);
+						assertThat(result.path("found").asBoolean()).isTrue();
+					}
+				});
+	}
+
 }