Make ElasticSearchAutoConfiguration conditional on SD Elasticsearch

ElasticSearchAutoConfiguration depends on two Spring Data Elasticsearch
classes (TransportClientFactoryBean and NodeClientFactoryBean), however
it’s only conditional on Elasticsearch itself being on the classpath.
This lead to start up failures due to a ClassNotFoundException. Its
@ConditionalOnClass configuration has been updated so that the
auto-configuration will only be enabled if both Elasticsearch and Spring
Data Elasticsearch are on the classpath.

The dependencies on TransportClientFactoryBean and NodeClientFactoryBean
were ‘hidden’ in ElasticsearchProperties. The logic that uses these
types has been moved into ElasticSearchAutoConfiguration so that the
usage of the types and the related @ConditionalOnClass configuration
is in the same file.

Fixes #1023

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

@@ -25,17 +25,22 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.data.elasticsearch.client.NodeClientFactoryBean;
+import org.springframework.data.elasticsearch.client.TransportClientFactoryBean;
+import org.springframework.util.StringUtils;
 
 /**
  * {@link org.springframework.boot.autoconfigure.EnableAutoConfiguration
  * Auto-configuration} for Elasticsearch.
- * 
+ *
  * @author Artur Konczak
  * @author Mohsin Husen
+ * @author Andy Wilkinson
  * @since 1.1.0
  */
 @Configuration
-@ConditionalOnClass(Client.class)
+@ConditionalOnClass({ Client.class, TransportClientFactoryBean.class,
+		NodeClientFactoryBean.class })
 @EnableConfigurationProperties(ElasticsearchProperties.class)
 public class ElasticsearchAutoConfiguration implements DisposableBean {
 
@@ -48,10 +53,35 @@ public class ElasticsearchAutoConfiguration implements DisposableBean {
 
 	@Bean
 	public Client elasticsearchClient() {
-		this.client = this.properties.createClient();
+		try {
+			if (StringUtils.hasLength(this.properties.getClusterNodes())) {
+				this.client = createTransportClient();
+			}
+			else {
+				this.client = createNodeClient();
+			}
+		}
+		catch (Exception ex) {
+			throw new IllegalStateException(ex);
+		}
 		return this.client;
 	}
 
+	private Client createNodeClient() throws Exception {
+		NodeClientFactoryBean factory = new NodeClientFactoryBean(true);
+		factory.setClusterName(this.properties.getClusterName());
+		factory.afterPropertiesSet();
+		return factory.getObject();
+	}
+
+	private Client createTransportClient() throws Exception {
+		TransportClientFactoryBean factory = new TransportClientFactoryBean();
+		factory.setClusterName(this.properties.getClusterName());
+		factory.setClusterNodes(this.properties.getClusterNodes());
+		factory.afterPropertiesSet();
+		return factory.getObject();
+	}
+
 	@Override
 	public void destroy() throws Exception {
 		if (this.client != null) {

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

@@ -16,15 +16,11 @@
 
 package org.springframework.boot.autoconfigure.elasticsearch;
 
-import org.elasticsearch.client.Client;
 import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.data.elasticsearch.client.NodeClientFactoryBean;
-import org.springframework.data.elasticsearch.client.TransportClientFactoryBean;
-import org.springframework.util.StringUtils;
 
 /**
  * Configuration properties for Elasticsearch.
- * 
+ *
  * @author Artur Konczak
  * @author Mohsin Husen
  * @since 1.1.0
@@ -36,8 +32,6 @@ public class ElasticsearchProperties {
 
 	private String clusterNodes;
 
-	private boolean local = true;
-
 	public String getClusterName() {
 		return this.clusterName;
 	}
@@ -53,30 +47,4 @@ public class ElasticsearchProperties {
 	public void setClusterNodes(String clusterNodes) {
 		this.clusterNodes = clusterNodes;
 	}
-
-	public Client createClient() {
-		try {
-			return (StringUtils.hasLength(this.clusterNodes) ? createTransportClient()
-					: createNodeClient());
-		}
-		catch (Exception ex) {
-			throw new IllegalStateException(ex);
-		}
-	}
-
-	private Client createNodeClient() throws Exception {
-		NodeClientFactoryBean factory = new NodeClientFactoryBean(this.local);
-		factory.setClusterName(this.clusterName);
-		factory.afterPropertiesSet();
-		return factory.getObject();
-	}
-
-	private Client createTransportClient() throws Exception {
-		TransportClientFactoryBean factory = new TransportClientFactoryBean();
-		factory.setClusterName(this.clusterName);
-		factory.setClusterNodes(this.clusterNodes);
-		factory.afterPropertiesSet();
-		return factory.getObject();
-	}
-
 }