Error on response after modifying request API from _msearch to _search

[Henriquelange]

Affected Projects: Reactivesearch / ReactiveCore

Library Version: 3.0.1

Describe the bug
Using the Reactivesearch documentation as a baseline, I changed the request API endpoint as follow:

The request was processed nicely by Elasticsearch. However, the following error was thrown while the library was processing the response:

As I checked, the problem is that the handleResponse method tries to directly access a "responses" property from the body, and the search API doesn't return an array of responses - it returns a single response.

To Reproduce
Steps to reproduce the behavior:
Just modify any request using transformRequest as described above.

Expected behavior
The single response from the _search API should be processed succesfully.