Firestore Batch Insert (Kotlin)

val db = FirebaseFirestore.getInstance()val batch = db.batch()for (i in 1..10) {    val docRef = db.collection("test").document()    batch.set(docRef, mapOf(        "created" to FieldValue.serverTimestamp(),        "posted_date" to Timestamp.now(),        "sequence" to i    ))}batch.commit().addOnCompleteListener {    Timber.d("batch: complete")}