我想我找到了！:)

这个项目似乎完全符合我的要求：aws-signing-request-
interceptor，描述为 “
Apache客户端的请求拦截器，用于对AWS的请求进行签名。最初是为了通过Jest客户端支持AWS的Elasticsearch Service而创建的。”
。

编辑：我分叉了项目，以满足我的需要（Java 7，临时STS凭据），并且效果很好。

这是用法示例（此处没有STS临时凭据）：

String region = "us-east-1";
String service = "es";
String url = "???"; // put the AWS ElasticSearch endpoint here

DefaultAWSCredentialsProviderChain awsCredentialsProvider = new DefaultAWSCredentialsProviderChain();
final AWSSigner awsSigner = new AWSSigner(awsCredentialsProvider, region, service, () -> new LocalDateTime(DateTimeZone.UTC));

JestClientFactory factory = new JestClientFactory() {
    @Override
    protected HttpClientBuilder configureHttpClient(HttpClientBuilder builder) {
        builder.addInterceptorLast(new AWSSigningRequestInterceptor(awsSigner));
        return builder;
    }
};
factory.setHttpClientConfig(new HttpClientConfig.Builder(url)
        .multiThreaded(true)
        .build());
JestClient client = factory.getObject();