Geospatial search is not working

Hello,

I'm using ckan 2.8.2, and I have installed ckanext-spatial following the instructions in the ckan documentation.

I have selected the search backend to be solr by writing the following line in the production.ini
```ckanext.spatial.search_backend = solr```

and updated the solr xml schema by putting the following lines inside the `` block
```

```

and ran this command to rebuild the search-index.
ckan-paster --plugin=ckan search-index rebuild --config=/etc/ckan/production.ini


However, when I use the geospatial search, it returns no results even though some datasets have the "spatial" extra field in the same area.


Review the ckanext.spatial.search_backend setting in production.ini and the added fields in the Solr XML schema. Re-run the documented ckan-paster search-index rebuild command and verify the indexed spatial values against a geospatial query. Done means datasets with spatial extents in the queried area are returned.

Written by the indexing model from the issue text.