Please go to https://opensolr.com/pricing and make sure you select the analytics option from the extra features tab, when you upgrade your account. 

If you can see analytics but no data, make sure your solr queries are correctly formated in the form:
https://server.opensolr.com/solr/index_name/select?q=your_query&other_params... 

So, the search query must be clearly visible in the q parameter in order for it to show in analytics.