如何使用Olivere的elastic client.Update（）服务更改数组字段，通用字符串字段以及可能嵌套的结构字段？

Question

https://github.com/olivere/elastic Version 5.x

The wiki documentation isn't really clear on how client.Update() works. It's needed to completely change a field and to modify arrays. i.e. in the example in the wiki documentation, how would one go about appending and removing tags to a tweet or changing a tweet's content? Also if a tweet was represented in go as a struct and I added a nested struct called "echo" which contains a foo of type int, content of type string and another type string array, how would one go about changing any of these fields using client.Update() if it's even possible?

In my personal example I have this function:

func UpdateEntryContent(eclient *elastic.Client, entryID string, newContent []rune) error{
    ctx:=context.Background()

    exists, err := eclient.IndexExists(ENTRY_INDEX).Do(ctx)
    if err != nil {return err}
    if !exists {return errors.New("Index does not exist")}

    _, err = eclient.Update().Index(ENTRY_INDEX).Type(ENTRY_TYPE).Id(entryID).
        Script("ctx._source.Content = newCont").
        ScriptParams(map[string]interface{}{"newCont": newContent}).
        Do(ctx)

    if err != nil {return err}

    return nil
}

But I get this following error when I try to compile:

cannot use "ctx._source.Content = newCont" (type string) as type *elastic.Script in argument to eclient.Update().Index(ENTRY_INDEX).Type(ENTRY_TYPE).Id(entryID).Script

eclient.Update().Index(ENTRY_INDEX).Type(ENTRY_TYPE).Id(entryID).Script("ctx._source.Content = newCont").ScriptParams undefined (type *elastic.UpdateService has no field or method ScriptParams)

Answer 1

Credit where it's due Gavin's answer put me on the right track. This is for another .Index but the full function that acts as a generic single field update is as follows:

func UpdateUser(eclient *elastic.Client, userID string, field string, newContent interface{})error {
    //CHANGES A SINGLE FIELD OF ES USER DOCUMENT(requires an elastic client pointer,
    //  the user DocID, the feild you wish to modify as a string,
    //  and what you want to change that field to as any type necessary)
    //RETURN AN error IF SUCESSFUL error = nil

    ctx := context.Background()

    exists, err := eclient.IndexExists(USER_INDEX).Do(ctx)
    if err != nil {return err}
    if !exists {return errors.New("Index does not exist")}

    _, err = eclient.Update().
        Index(USER_INDEX).
        Type(USER_TYPE).
        Id(userID).
        Doc(map[string]interface{}{field: newContent}).
        Do(ctx)


    return nil
}

You can change the .Index, .Type, and .Id and it works with all fields and types as far as I can tell