How to plan and implement shard allocation awareness for the below 3 master 6 data node setup

Elastic Stack Elasticsearch
1

Current setup hosted in aws ec2, self managed/hosted opensource version of elasticsearch

master-1 - us-east-1a
master-2 - us-east-1b
master-2 - us-east-1c

data-1 -  us-east-1a
data-2 -  us-east-1b
data-3 -  us-east-1c
data-4 -  us-east-1d
data-5 -  us-east-1f
data-6 -  us-east-1a

My plan
Adding below config to the elasticsearch.yml and restarting service one node at a time

data-1


node.attr.zone: us-east-1a 
cluster.routing.allocation.awareness.attributes: zone

restart elasticsearch service

data-2


node.attr.zone: us-east-1b 
cluster.routing.allocation.awareness.attributes: zone

restart elasticsearch service

data-3

node.attr.zone: us-east-1c 
cluster.routing.allocation.awareness.attributes: zone

restart elasticsearch service

data-4


node.attr.zone: us-east-1d 
cluster.routing.allocation.awareness.attributes: zone

restart elasticsearch service

data-5

node.attr.zone: us-east-1f
cluster.routing.allocation.awareness.attributes: zone

restart elasticsearch service

data-6


node.attr.zone: us-east-1a
cluster.routing.allocation.awareness.attributes: zone

restart elasticsearch service

run from kibana dev tools

PUT _cluster/settings
{
  "persistent": {
    "cluster.routing.allocation.awareness.attributes": "zone",
    "cluster.routing.allocation.awareness.force.zone.values": "us-east-1a ,us-east-1b,us-east-1c,us-east-1d,us-east-1f"
  }
}

Note: data-1 and data-6 are in the same az.

Does my plan look good with the above setup ? And should the same setting be applied for master nodes as well in similar manner to the data nodes ?

How can I validate after the above steps to make sure things are good ?

2

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