Elasticsearch CreateIndex（）参数不足

I am trying to use Elasticsearch for GO with this well-known repo

However, when I am trying to create an index (docs, and also given as an example here):

    // Define an elastic client 
    client, err := elastic.NewClient(elastic.SetURL("host1"))
    if err != nil {
        client, err := elastic.NewClient(elastic.SetURL("host2"))
        if err != nil {
            fmt.Println("Error when connecting Elasticsearch host");    
        }
    }

    // Create an index
    _, err = client.CreateIndex("events").Do()
    if err != nil {
        fmt.Println("Error when creating Elasticsearch index"); 
        panic(err)
    }

I got the following error, which I do not understand:

not enough arguments in call to client.CreateIndex("events").Do

Why is that? What do I miss here?

The IndicesCreateService.Do() function expects a context.Context to be passed.

So, you need to import "golang.org/x/net/context" and then change your call to this:

import (
    ... your other imports...    
    "golang.org/x/net/context"
)
...
_, err := client.CreateIndex("events").Do(context.TODO())
                                                ^
                                                |
                                             add this

You can also check the indices_create_test.go test case in order to see how it's done.