Getting only up to 20 results

[Nick]

Hi all,

I'm following this example to setup Haystack with ES:

https://krzysztofzuraw.com/blog/2016/haystack-elasticsearch-part-one.html

Everything seems to be working but for every search I do I get only up to 20 records as a result. 

But actually there should be sometimes over 50 results.

I cannot find a setting neither for haystack nor for django which prevents showing more than 20 results.

So, where does this limitation come from? How can I change it?

Thanks

Nick