Building multiple indexes with one of them being unique in Mongo

This is in continuation to Building Multiple Indexes at Once, where I am currently making use of the following commands

db.test_collection_data.createIndex({"uId" : 1, "name" : 1}, {unique : 1})
db.test_collection_data.createIndex({"uId" : "hashed"})
db.test_collection_data.createIndex({"uId" : 1, "products" : 1})
db.test_collection_data.createIndex({"bId" : 1})

I want to understand what is the correct way of transforming this into a single command to be executed at the server. My failed attempts are as follows:

#uniqueness is lost for the first index
db.test_collection_data.createIndexes(
   [
     {"uId" : 1,"name":1},
     {"uId" : "hashed"},
     {"uId" : 1,"products":1},
     {"bId" : 1}
   ]
)


#unable to create since products are not really unique
db.test_collection_data.createIndexes(
   [
     {"uId" : 1,"name":1},
     {"uId" : "hashed"},
     {"uId" : 1,"products":1},
     {"bId" : 1}
   ],
   {
     unique: true
   }
)

This is in continuation to Building Multiple Indexes at Once,

There is a answer provided the reference to createIndexes, The createIndexes command takes the form of runCommand: you could use, syntax and example,

• change your real database name in Your database name and collection name in test_collection_data,

db.getSiblingDB("Your database name").runCommand(
  {
    createIndexes: "test_collection_data",
    indexes: [
        {
            key: {
                "uId": 1,
                "name": 1
            },
            unique : true,
            name: "_uId_name_"
        },
        {
            key: {
                "uId": "hashed"
            },
            name: "_uId_"
        },
        {
            key: {
                "uId": 1,
                "products": 1
            },
            name: "_uId_products_"
        },
        {
            key: {
                "bId": 1
            },
            name: "_bId_"
        }
    ]
  }
)