AWS ElasticSearch不需要Web应用程序API进行集成。AWS提供一系列API和SDK来与ElasticSearch进行交互。以下是使用AWS SDK for JavaScript与ElasticSearch进行交互的示例代码：

// 导入AWS SDK for JavaScript和ElasticSearch模块
const AWS = require('aws-sdk');
const elasticsearch = require('elasticsearch');

// 配置AWS ElasticSearch的凭证和端点
const creds = new AWS.EnvironmentCredentials('AWS');
const endpoint = 'my-elasticsearch-endpoint.amazonaws.com';

// 初始化ElasticSearch客户端
const esClient = new elasticsearch.Client({
  hosts: [endpoint],
  connectionClass: require('http-aws-es'),
  amazonES: {
    credentials: creds,
    region: 'us-east-1'
  }
});

// 示例：搜索ElasticSearch中名为"my_index"、类型为"my_type"的文档
esClient.search({
  index: 'my_index',
  type: 'my_type',
  q: 'my_search_query'
}).then(function(resp) {
  console.log(resp);
}, function(err) {
  console.log(err);
});