How I Made Sense of the Master User in the Amazon OpenSearch Service (previously, ElasticSearch)

Photo by Jacqueline Godany on Unsplash

If you are reading this post, it’s probably because you are knees deep into figuring out how to enable fine-grained access control. And that means you are delegating most of your identity and access management to the controls of the Open Distro for ElasticSearch (now OpenSearch) instead of AWS IAM. This is explained in the…