Currently, $clusterTopology retrieves a document containing information about the cluster's topology. An example of the current structure is as follows:

{	
	shards: [
		{
			name: 'shard-rs0',
			host: 'shard-rs0/ip-10-122-6-112:20043'
		},
		{
			name: 'shard-rs1',
			host: 'shard-rs1/ip-10-122-6-112:20044'
		}
	],
	activeRouters: [
		...
	]
}

The aim of this task is to introduce a new field within each shard document to indicate the draining status, similar to what the listShards command does.