package main

import (
    "context"
    "fmt"
    "log"

    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)

const uri = "mongodb://localhost"

func main() {
    ctx := context.Background()
    opts := options.Client().ApplyURI(uri)
    if err := opts.Validate(); err != nil {
        log.Fatal(err)
    }
    client, err := mongo.NewClient(opts)
    if err != nil {
        log.Fatal(err)
    }
    if err := client.Connect(ctx); err != nil {
        log.Fatal(err)
    }
    defer client.Disconnect(ctx)

    coll := client.Database("bulkwrite").Collection("bulkwrite")
    models := []mongo.WriteModel{
        &mongo.DeleteOneModel{Filter: bson.D{{"_id", "id0"}}},
        &mongo.InsertOneModel{Document: bson.D{{"_id", "id1"}}},
        &mongo.DeleteOneModel{Filter: bson.D{{"_id", "id2"}}},
        &mongo.InsertOneModel{Document: bson.D{{"_id", "id3"}}},
        &mongo.DeleteOneModel{Filter: bson.D{{"_id", "id4"}}},
    }
    _, err = coll.BulkWrite(ctx, models, options.BulkWrite().SetOrdered(false))
    if err != nil {
        for _, err := range err.(mongo.BulkWriteException).WriteErrors {
            fmt.Println(err.Code, err.Index)
        }
    }
}