使用 Amazon SDK 与 Amazon OpenSearch Service 进行交互

此示例使用 Amazon SDK for Java 的版本 2 中的 AmazonOpenSearchClientBuilder 构造函数创建 OpenSearch 域、更新其配置和对其进行删除。取消注释对 waitForDomainProcessing 的调用（并注释对 deleteDomain 的调用）以允许域上线并可供使用。

package com.example.samples;

import java.util.concurrent.TimeUnit;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.opensearch.OpenSearchClient;
import software.amazon.awssdk.services.opensearch.model.ClusterConfig;
import software.amazon.awssdk.services.opensearch.model.EBSOptions;
import software.amazon.awssdk.services.opensearch.model.CognitoOptions;
import software.amazon.awssdk.services.opensearch.model.NodeToNodeEncryptionOptions;
import software.amazon.awssdk.services.opensearch.model.CreateDomainRequest;
import software.amazon.awssdk.services.opensearch.model.CreateDomainResponse;
import software.amazon.awssdk.services.opensearch.model.DescribeDomainRequest;
import software.amazon.awssdk.services.opensearch.model.UpdateDomainConfigRequest;
import software.amazon.awssdk.services.opensearch.model.UpdateDomainConfigResponse;
import software.amazon.awssdk.services.opensearch.model.DescribeDomainResponse;
import software.amazon.awssdk.services.opensearch.model.DeleteDomainRequest;
import software.amazon.awssdk.services.opensearch.model.DeleteDomainResponse;
import software.amazon.awssdk.services.opensearch.model.OpenSearchException;
import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;

/**
 * Sample class demonstrating how to use the Amazon Web Services SDK for Java to create, update,
 * and delete Amazon OpenSearch Service domains.
 */

public class OpenSearchSample {

    public static void main(String[] args) {

    	String domainName = "my-test-domain";
    	
    	// Build the client using the default credentials chain.
        // You can use the CLI and run `aws configure` to set access key, secret
        // key, and default region.
    	
        OpenSearchClient client = OpenSearchClient.builder()
        		// Unnecessary, but lets you use a region different than your default.
        		.region(Region.US_EAST_1)
        		// Unnecessary, but if desired, you can use a different provider chain.
        		.credentialsProvider(DefaultCredentialsProvider.create())
                     .build();
        
        // Create a new domain, update its configuration, and delete it.
        createDomain(client, domainName);
        //waitForDomainProcessing(client, domainName);
        updateDomain(client, domainName);
        //waitForDomainProcessing(client, domainName);
        deleteDomain(client, domainName);
    }
    
    /**
     * Creates an Amazon OpenSearch Service domain with the specified options.
     * Some options require other Amazon Web Services resources, such as an Amazon Cognito user pool
     * and identity pool, whereas others require just an instance type or instance
     * count.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain you want to create
     */

    public static void createDomain(OpenSearchClient client, String domainName) {
    	
    	// Create the request and set the desired configuration options

        try {

            ClusterConfig clusterConfig = ClusterConfig.builder()
                    .dedicatedMasterEnabled(true)
                    .dedicatedMasterCount(3)
                    // Small, inexpensive instance types for testing. Not recommended for production.
                    .dedicatedMasterType("t2.small.search")
                    .instanceType("t2.small.search")
                    .instanceCount(5)
                    .build();

            // Many instance types require EBS storage.
            EBSOptions ebsOptions = EBSOptions.builder()
                    .ebsEnabled(true)
                    .volumeSize(10)
                    .volumeType("gp2")
                    .build();

            NodeToNodeEncryptionOptions encryptionOptions = NodeToNodeEncryptionOptions.builder()
                    .enabled(true)
                    .build();

            CreateDomainRequest createRequest = CreateDomainRequest.builder()
                    .domainName(domainName)
                    .engineVersion("OpenSearch_1.0")
                    .clusterConfig(clusterConfig)
                    .ebsOptions(ebsOptions)
                    .nodeToNodeEncryptionOptions(encryptionOptions)
                    // You can uncomment this line and add your account ID, a username, and the
                    // domain name to add an access policy.
                    // .accessPolicies("{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"arn:aws:iam::123456789012:user/user-name\"]},\"Action\":[\"es:*\"],\"Resource\":\"arn:aws:es:region:123456789012:domain/domain-name/*\"}]}")
                    .build();
            
            // Make the request.
            System.out.println("Sending domain creation request...");
            CreateDomainResponse createResponse = client.createDomain(createRequest);
            System.out.println("Domain status: "+createResponse.domainStatus().toString());
            System.out.println("Domain ID: "+createResponse.domainStatus().domainId());


        } catch (OpenSearchException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
    
    /**
     * Updates the configuration of an Amazon OpenSearch Service domain with the
     * specified options. Some options require other Amazon Web Services resources, such as an
     * Amazon Cognito user pool and identity pool, whereas others require just an
     * instance type or instance count.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain to update
     */
    
    public static void updateDomain(OpenSearchClient client, String domainName) {

    	// Updates the domain to use three data instances instead of five.
        // You can uncomment the Cognito line and fill in the strings to enable Cognito
        // authentication for OpenSearch Dashboards.
    	
        try {

            ClusterConfig clusterConfig = ClusterConfig.builder()
                    .instanceCount(5)
                    .build();
            
            CognitoOptions cognitoOptions = CognitoOptions.builder()
                    .enabled(true)
                    .userPoolId("user-pool-id")
                    .identityPoolId("identity-pool-id")
                    .roleArn("role-arn")
                    .build();

            UpdateDomainConfigRequest updateRequest = UpdateDomainConfigRequest.builder()
                    .domainName(domainName)
                    .clusterConfig(clusterConfig)
                    //.cognitoOptions(cognitoOptions)
                    .build();

            System.out.println("Sending domain update request...");
            UpdateDomainConfigResponse updateResponse = client.updateDomainConfig(updateRequest);
            System.out.println("Domain config: "+updateResponse.domainConfig().toString());


        } catch (OpenSearchException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
    
    /**
     * Deletes an Amazon OpenSearch Service domain. Deleting a domain can take
     * several minutes.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain that you want to delete
     */
    
    public static void deleteDomain(OpenSearchClient client, String domainName) {

        try {

            DeleteDomainRequest deleteRequest = DeleteDomainRequest.builder()
                    .domainName(domainName)
                    .build();

            System.out.println("Sending domain deletion request...");
            DeleteDomainResponse deleteResponse = client.deleteDomain(deleteRequest);
            System.out.println("Domain status: "+deleteResponse.toString());


        } catch (OpenSearchException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
    
    /**
     * Waits for the domain to finish processing changes. New domains typically take 15-30 minutes
     * to initialize, but can take longer depending on the configuration. Most updates to existing domains
     * take a similar amount of time. This method checks every 15 seconds and finishes only when
     * the domain's processing status changes to false.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain that you want to check
     */
    
    public static void waitForDomainProcessing(OpenSearchClient client, String domainName) {
        // Create a new request to check the domain status.
        DescribeDomainRequest describeRequest = DescribeDomainRequest.builder()
                .domainName(domainName)
                .build();

        // Every 15 seconds, check whether the domain is processing.
        DescribeDomainResponse describeResponse = client.describeDomain(describeRequest);
        while (describeResponse.domainStatus().processing()) {
            try {
                System.out.println("Domain still processing...");
                TimeUnit.SECONDS.sleep(15);
                describeResponse = client.describeDomain(describeRequest);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        // Once we exit that loop, the domain is available
        System.out.println("Amazon OpenSearch Service has finished processing changes for your domain.");
        System.out.println("Domain description: "+describeResponse.toString());
    }
}

此示例使用 Amazon SDK for Java 的版本 1 中的 AWSElasticsearchClientBuilder 构造函数创建旧式 Elasticsearch 域，更新其配置和对其进行删除。取消注释对 waitForDomainProcessing 的调用（并注释对 deleteDomain 的调用）以允许域上线并可供使用。

package com.amazonaws.samples;

import java.util.concurrent.TimeUnit;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.elasticsearch.AWSElasticsearch;
import com.amazonaws.services.elasticsearch.AWSElasticsearchClientBuilder;
import com.amazonaws.services.elasticsearch.model.CreateElasticsearchDomainRequest;
import com.amazonaws.services.elasticsearch.model.CreateElasticsearchDomainResult;
import com.amazonaws.services.elasticsearch.model.DeleteElasticsearchDomainRequest;
import com.amazonaws.services.elasticsearch.model.DeleteElasticsearchDomainResult;
import com.amazonaws.services.elasticsearch.model.DescribeElasticsearchDomainRequest;
import com.amazonaws.services.elasticsearch.model.DescribeElasticsearchDomainResult;
import com.amazonaws.services.elasticsearch.model.EBSOptions;
import com.amazonaws.services.elasticsearch.model.ElasticsearchClusterConfig;
import com.amazonaws.services.elasticsearch.model.ResourceNotFoundException;
import com.amazonaws.services.elasticsearch.model.UpdateElasticsearchDomainConfigRequest;
import com.amazonaws.services.elasticsearch.model.UpdateElasticsearchDomainConfigResult;
import com.amazonaws.services.elasticsearch.model.VolumeType;

/**
 * Sample class demonstrating how to use the Amazon Web Services SDK for Java to create, update,
 * and delete Amazon OpenSearch Service domains.
 */

public class OpenSearchSample {

    public static void main(String[] args) {

        final String domainName = "my-test-domain";

        // Build the client using the default credentials chain.
        // You can use the CLI and run `aws configure` to set access key, secret
        // key, and default region.
        final AWSElasticsearch client = AWSElasticsearchClientBuilder
                .standard()
                // Unnecessary, but lets you use a region different than your default.
                .withRegion(Regions.US_WEST_2)
                // Unnecessary, but if desired, you can use a different provider chain.
                .withCredentials(new DefaultAWSCredentialsProviderChain())
                .build();

        // Create a new domain, update its configuration, and delete it.
        createDomain(client, domainName);
        // waitForDomainProcessing(client, domainName);
        updateDomain(client, domainName);
        // waitForDomainProcessing(client, domainName);
        deleteDomain(client, domainName);
    }

    /**
     * Creates an Amazon OpenSearch Service domain with the specified options.
     * Some options require other Amazon Web Services resources, such as an Amazon Cognito user pool
     * and identity pool, whereas others require just an instance type or instance
     * count.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain you want to create
     */
    private static void createDomain(final AWSElasticsearch client, final String domainName) {

        // Create the request and set the desired configuration options
        CreateElasticsearchDomainRequest createRequest = new CreateElasticsearchDomainRequest()
                .withDomainName(domainName)
                .withElasticsearchVersion("7.10")
                .withElasticsearchClusterConfig(new ElasticsearchClusterConfig()
                        .withDedicatedMasterEnabled(true)
                        .withDedicatedMasterCount(3)
                        // Small, inexpensive instance types for testing. Not recommended for production
                        // domains.
                        .withDedicatedMasterType("t2.small.elasticsearch")
                        .withInstanceType("t2.small.elasticsearch")
                        .withInstanceCount(5))
                // Many instance types require EBS storage.
                .withEBSOptions(new EBSOptions()
                        .withEBSEnabled(true)
                        .withVolumeSize(10)
                        .withVolumeType(VolumeType.Gp2));
                // You can uncomment this line and add your account ID, a username, and the
                // domain name to add an access policy.
                // .withAccessPolicies("{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"arn:aws:iam::123456789012:user/user-name\"]},\"Action\":[\"es:*\"],\"Resource\":\"arn:aws:es:region:123456789012:domain/domain-name/*\"}]}")
                

        // Make the request.
        System.out.println("Sending domain creation request...");
        CreateElasticsearchDomainResult createResponse = client.createElasticsearchDomain(createRequest);
        System.out.println("Domain creation response from Amazon OpenSearch Service:");
        System.out.println(createResponse.getDomainStatus().toString());
    }

    /**
     * Updates the configuration of an Amazon OpenSearch Service domain with the
     * specified options. Some options require other Amazon Web Services resources, such as an
     * Amazon Cognito user pool and identity pool, whereas others require just an
     * instance type or instance count.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain to update
     */
    private static void updateDomain(final AWSElasticsearch client, final String domainName) {
        try {
            // Updates the domain to use three data instances instead of five.
            // You can uncomment the Cognito lines and fill in the strings to enable Cognito
            // authentication for OpenSearch Dashboards.
            final UpdateElasticsearchDomainConfigRequest updateRequest = new UpdateElasticsearchDomainConfigRequest()
                    .withDomainName(domainName)
                    // .withCognitoOptions(new CognitoOptions()
                            // .withEnabled(true)
                            // .withUserPoolId("user-pool-id")
                            // .withIdentityPoolId("identity-pool-id")
                            // .withRoleArn("role-arn")
                    .withElasticsearchClusterConfig(new ElasticsearchClusterConfig()
                            .withInstanceCount(3));

            System.out.println("Sending domain update request...");
            final UpdateElasticsearchDomainConfigResult updateResponse = client
                    .updateElasticsearchDomainConfig(updateRequest);
            System.out.println("Domain update response from Amazon OpenSearch Service:");
            System.out.println(updateResponse.toString());
        } catch (ResourceNotFoundException e) {
            System.out.println("Domain not found. Please check the domain name.");
        }
    }

    /**
     * Deletes an Amazon OpenSearch Service domain. Deleting a domain can take
     * several minutes.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain that you want to delete
     */
    private static void deleteDomain(final AWSElasticsearch client, final String domainName) {
        try {
            final DeleteElasticsearchDomainRequest deleteRequest = new DeleteElasticsearchDomainRequest()
                    .withDomainName(domainName);

            System.out.println("Sending domain deletion request...");
            final DeleteElasticsearchDomainResult deleteResponse = client.deleteElasticsearchDomain(deleteRequest);
            System.out.println("Domain deletion response from Amazon OpenSearch Service:");
            System.out.println(deleteResponse.toString());
        } catch (ResourceNotFoundException e) {
            System.out.println("Domain not found. Please check the domain name.");
        }
    }

    /**
     * Waits for the domain to finish processing changes. New domains typically take 15-30 minutes
     * to initialize, but can take longer depending on the configuration. Most updates to existing domains
     * take a similar amount of time. This method checks every 15 seconds and finishes only when
     * the domain's processing status changes to false.
     *
     * @param client
     *            The client to use for the requests to Amazon OpenSearch Service
     * @param domainName
     *            The name of the domain that you want to check
     */
    private static void waitForDomainProcessing(final AWSElasticsearch client, final String domainName) {
        // Create a new request to check the domain status.
        final DescribeElasticsearchDomainRequest describeRequest = new DescribeElasticsearchDomainRequest()
                .withDomainName(domainName);

        // Every 15 seconds, check whether the domain is processing.
        DescribeElasticsearchDomainResult describeResponse = client.describeElasticsearchDomain(describeRequest);
        while (describeResponse.getDomainStatus().isProcessing()) {
            try {
                System.out.println("Domain still processing...");
                TimeUnit.SECONDS.sleep(15);
                describeResponse = client.describeElasticsearchDomain(describeRequest);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        // Once we exit that loop, the domain is available
        System.out.println("Amazon OpenSearch Service has finished processing changes for your domain.");
        System.out.println("Domain description response from Amazon OpenSearch Service:");
        System.out.println(describeResponse.toString());
    }
}