Solr query alter

I'm working with search_api_solr and facet module in drupal 8 but, while solr search from my site I get url, it's like this http: //siteurl.local/products-filter-solr? F[0]= t: 951 but according to the requirements query it would be http: //siteurl.local/products-filter-solr? category = cat1 & t = taxo1

I am looking for a way to alter the solr query according to my requirement but I have not been successful.
Thanks in advance.