要在AWS托管的Elasticsearch上使用Java Elasticsearch高级REST客户端库，你可以按照以下步骤进行操作：

步骤1：添加依赖 在你的Java项目中添加Elasticsearch高级REST客户端库的依赖。你可以在pom.xml文件中添加以下代码：

    org.elasticsearch.client
    elasticsearch-rest-high-level-client
    7.15.0

步骤2：创建Elasticsearch客户端 使用以下代码创建Elasticsearch客户端：

import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;

public class ElasticsearchClient {

    public static RestHighLevelClient createClient() {
        String hostname = "your-elasticsearch-hostname";
        int port = 443;
        String scheme = "https";

        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY,
                new UsernamePasswordCredentials("your-username", "your-password"));

        RestClientBuilder builder = RestClient.builder(new HttpHost(hostname, port, scheme))
                .setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));

        return new RestHighLevelClient(builder);
    }
}

请确保将"your-elasticsearch-hostname"、"your-username"和"your-password"替换为你的Elasticsearch主机名、用户名和密码。

步骤3：执行操作 使用以下示例代码执行一些基本操作，如索引文档、搜索文档和删除文档：

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;

public class ElasticsearchExample {

    public static void main(String[] args) {
        try (RestHighLevelClient client = ElasticsearchClient.createClient()) {
            // 索引文档
            IndexRequest request = new IndexRequest("your-index")
                    .id("your-document-id")
                    .source("field1", "value1",
                            "field2", "value2");

            IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);

            // 搜索文档
            SearchRequest searchRequest = new SearchRequest("your-index");
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            searchSourceBuilder.query(QueryBuilders.matchQuery("field1", "value1"));
            searchRequest.source(searchSourceBuilder);

            SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

            // 删除文档
            DeleteRequest deleteRequest = new DeleteRequest("your-index")
                    .id("your-document-id");

            DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

请确保将"your-index"和"your-document-id"替换为你要操作的索引名称和文档ID。

通过上述步骤，你就可以在AWS托管的Elasticsearch上使用Java Elasticsearch高级REST客户端库执行各种操作了。