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Signing an Amazon Elasticsearch Service Search Request

Amazon Elasticsearch Service (Amazon ES) is a managed service that makes it easy to deploy, operate, and scale Elasticsearch, a popular open-source search and analytics engine. Amazon ES offers direct access to the Elasticsearch API, meaning that developers can use the tools with which they’re familiar, as well as robust security options, such as using IAM users and roles for access control. Many Elasticsearch clients support request signing, but if you're using a client that doesn't, you can sign arbitrary PSR-7 requests with the SDK's built-in credential providers and signers.

Signing an Amazon ES Request

Amazon ES uses Signature Version 4, which means that you will need to sign requests against the service's signing name (es, in this case) and the region of your Amazon ES domain. A full list of regions supported by Amazon ES can be found on AWS's Regions and Endpoints page, but in this sample, I'll be signing requests against an Amazon ES domain in the us-west-2 region.

You'll need to provide credentials, which can be done either with the SDK's default provider chain or any any form of credentials described in Credentials, as well as a PSR-7 request (assumed in the code below to be named $psr7Request):

// Pull credentials from the default provider chain
$provider = Aws\Credentials\CredentialProvider::defaultProvider();
$credentials = call_user_func($provider)->wait();

// Create a signer with the service's signing name and region
$signer = new Aws\Signature\SignatureV4('es', 'us-west-2');

// Sign your request
$signedRequest = $signer->signRequest($psr7Request, $credentials);
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