Application.java

package com.eblock.api;

import java.io.InputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.shield.ShieldPlugin;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@SpringBootApplication
@ComponentScan(basePackages = {"com.domain.api"})
@PropertySource("classpath:application.properties")
public class Application extends WebMvcConfigurerAdapter {
    @Autowired
    private Environment env;

    @Bean
    public Client elasticSearchClient()
    {
        final String clusterName  = env.getProperty("elasticsearch.cluster.name");
        final String hostname     = env.getProperty("elasticsearch.transport.hostname");
        final String pingSchedule = env.getProperty("elasticsearch.transport.pingSchedule");
        final int port            = Integer.parseInt(env.getProperty("elasticsearch.transport.port"));
        final boolean enableSSL   = Boolean.parseBoolean(env.getProperty("elasticsearch.transport.ssl"));
        final String shieldUser   = String.format(
            "%s:%s",
            env.getProperty("elasticsearch.shield.username"),
            env.getProperty("elasticsearch.shield.password")
        );

        final TransportClient.Builder transportClientBuilder = TransportClient.builder();
        final Settings.Builder settingsBuilder               = Settings.builder()
            .put("action.bulk.compress", false)
            .put("cluster.name", clusterName)
            .put("transport.sniff", false)
            .put("transport.ping_schedule", pingSchedule)
            .put("client.transport.ignore_cluster_name", false)
            .put("request.headers.X-Found-Cluster", clusterName)
            .put("shield.enabled", ! enableSSL)
        ;

        if (enableSSL) {
            transportClientBuilder.addPlugin(ShieldPlugin.class);

            settingsBuilder
                .put("shield.user", shieldUser)
                .put("shield.transport.ssl", enableSSL)
            ;
        }

        final TransportClient client = transportClientBuilder
            .settings(settingsBuilder.build())
            .build()
        ;

        try {
            for (InetAddress address : InetAddress.getAllByName(hostname)) {
                client.addTransportAddress(new InetSocketTransportAddress(address, port));
            }
        } catch (UnknownHostException exception) {
            throw new RuntimeException("Unknown host", exception);
        }

        return client;
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

application.properties

elasticsearch.cluster.name={my_cluster_name}
elasticsearch.transport.hostname={my_cluster_name}.{my_cluster_region}.aws.found.io
elasticsearch.transport.port=9343
elasticsearch.transport.ssl=true
elasticsearch.transport.pingSchedule=5s
elasticsearch.shield.user={my_shield_username}
elasticsearch.shield.password={my_shield_password}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.3.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- Elasticsearch -->
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>2.3.3</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.plugin</groupId>
            <artifactId>shield</artifactId>
            <version>2.3.3</version>
         </dependency>
         <!-- Testing -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <repositories>
        <repository>
            <id>elasticsearch-releases</id>
            <name>elasticsearch</name>
            <url>http://maven.elasticsearch.org/releases</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <executable>true</executable>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

2016-07-15 17:48:17.021  WARN 12075 --- [           main] ationConfigEmbeddedWebApplicationContext : 
Exception encountered during context initialization - cancelling refresh attempt: 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'elasticMapper': 
Invocation of init method failed; nested exception is NoNodeAvailableException[
None of the configured nodes are available: [
{#transport#-1}{<first_ip>}{<my_cluster_name>.us-east-1.aws.found.io/<first_ip>}:9343}, 
{#transport#-2}{<second_ip>}}{<my_cluster_name>.us-east-1.aws.found.io/<second_ip>:9343}, 
{#transport#-3}{<third_ip>}{<my_cluster_name>.us-east-1.aws.found.io/<third_ip>:9343}, 
{#transport#-4}{<fourth_ip>}{<my_cluster_name>.us-east-1.aws.found.io/<fourth_ip>:9343}, 
{#transport#-5}{<fifth_ip>}{<my_cluster_name>.us-east-1.aws.found.io/<fifth_ip>:9343}, 
{#transport#-6}{<sixth_ip>}{<my_cluster_name>.us-east-1.aws.found.io/<sixth_ip>:9343}
]]
2016-07-15 17:48:17.121  INFO 12075 --- [           main] o.e.jetty.server.handler.ContextHandler  : 
Stopped o.s.b.c.e.j.JettyEmbeddedWebAppContext@1a5ab108{/,file:/tmp/jetty-docbase.7495303663607529837.8080/,UNAVAILABLE}
2016-07-15 17:48:17.131 ERROR 12075 --- [           main] o.s.boot.SpringApplication               : 
Application startup failed