Adding index and freeze all members of a replSet

FreezeRepl-then-AddIndex.js

user='XXXX';
pass='XXXX';
indexPattern={ 'Key' : 1 };
indexOptions={};
db.getSiblingDB('config').shards.find({},{host:1,_id:0}).forEach(function(shard){ 
	tHosts = shard.host.split('/')[1].split(',')
	tHosts.forEach(function(host){
		print("Freezing "+ host);
		x= new Mongo(host); 
		x.getDB('admin').auth(user,pass);
		x.getDB('admin').getMongo().setSlaveOk(1);
		x.getDB('admin').runCommand({replSetFreeze:60});
	});
})

db.SearchKey.ensureIndex(indexPattern,indexOptions)