I am trying to set up a Solr Search View with Search API Solr and Search API location, witch is sorted by proximity an can be filtered by proximity.
To achieve that, 

* I created an search index, which indexes a geofield as `latitude/longitude` (under admin/config/search/search\_api/index/INDEX\_NAME/fields):[![enter image description here](https://i.stack.imgur.com/nvD9l.jpg)](https://i.stack.imgur.com/nvD9l.jpg)
* I created a View for the mentioned Search index and was able to add a proximity filter as contextual filter:[![enter image description here](https://i.stack.imgur.com/zqj25.jpg)](https://i.stack.imgur.com/zqj25.jpg)
	+ It is also possible to add the indexed Lat/Lon field to the field section of the View and set up a formatter showing the distance to a certain geolocation: [![enter image description here](https://i.stack.imgur.com/DESfw.jpg)](https://i.stack.imgur.com/DESfw.jpg)

But there wasn't any field I could add to the sort section or the filter section of the View, that filters or sorts by proximity.
What do I have to do, to filter and sort a Search API Solr View by proximity?