aws4
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Added X-Amz-Content-Sha256 for aoss.
Amazon Serverless OpenSearch requires X-Amz-Content-Sha256
too.
https://docs.aws.amazon.com/opensearch-service/latest/developerguide/serverless-clients.html
We've been having to add it in a lot of places, e.g. https://github.com/jamesmbourne/aws4-axios/pull/1621 or https://github.com/opensearch-project/opensearch-js/pull/366.