Steps to link ES cluster to s3 and create/restore snapshots

In the Account that the S3 bucket is going to live, create a new IAM policy with the following permissions:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": "iam:PassRole",
            "Resource": [
                "arn:aws:s3:::S3-BUCKET-NAME/*",
                "arn:aws:iam::ACCOUNT-ID:role/*"
            ]
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": "s3:ListBucket",
            "Resource": "arn:aws:s3:::S3-BUCKET-NAME"
        },
        {
            "Sid": "VisualEditor2",
            "Effect": "Allow",
            "Action": [
                "s3:PutObject",
                "s3:GetObject",
                "s3:DeleteObject"
            ],
            "Resource": "arn:aws:s3:::S3-BUCKET-NAME/*"
        }
    ]
}

Create a new Role in that AWS account with the above policy, and also create a Trust permission with the following details:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Statement1",
            "Effect": "Allow",
            "Principal": {
                "Service": "es.amazonaws.com"
            },
            "Action": "sts:AssumeRole"
        }
    ]
}

Create a new user in the account and give it the the policy created earlier

---------Create connection to repository
    
PUT: https://SOURCE-CLUSTER-ENDPOINT/_snapshot/snapshot-respository

Body: as JSON
    {   "type": "s3",
    "settings": {
        "bucket": "S3-BUCKET-NAME",
        "region": "us-east-1",
        "role_arn": "ARN FOR THE NEWLY CREATED ROLE"
    }
 }

--------Create backup

PUT: https://vpc-rbx-stg-es-6-8-f7kozzmqn3r2ygnqsqicjlrism.us-east-1.es.amazonaws.com/_snapshot/snapshot-respository/2023-01-05

--------Restore Status
GET: https://vpc-rbx-stg-es-6-8-f7kozzmqn3r2ygnqsqicjlrism.us-east-1.es.amazonaws.com/_snapshot/snapshot-respository/2023-01-05/_status

------Restore
POST: https://vpc-rbx-stg-es-6-8-shardings-ma7dgqmnnngrd6wthxwfgkot5u.us-east-1.es.amazonaws.com/_snapshot/snapshot-respository/2023-01-05/_restore

------Restore status
GET: https://vpc-rbx-stg-es-6-8-shardings-ma7dgqmnnngrd6wthxwfgkot5u.us-east-1.es.amazonaws.com/_cat/recovery