…1776)

Update changelog accordingly.

I added   auth_type option to resolve the problem of duplicate requests in [1789 issue](ruflin#1789 "1789 issue")
```php
        'auth_type' => null //basic, digest, gssnegotiate, ntlm
```

Ref ruflin#1475 

Currently, `AbstractUpdateAction::setRefresh` only accepts boolean values: 
- `true` - to perform an immediate refresh
- `false` - to not refresh at all

The [documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-refresh.html), however, strongly suggests the usage of `wait_for` option to ensure a good cluster performance while doing the refresh operation. But the problem is that `wait_for` is of type `string`; thus, we cannot pass it as an argument to the method.

This modifies `AbstractUpdateAction::setRefresh` so that arguments of type `string` such as `wait_for` can also be passed to the method. Additionally, the return type of its getter counterpart, `AbstractUpdateAction::getRefresh`, has also been modified to mirror the accepted types of the setter.

…n#1799)

update CHANGELOG.md