Allow operators in search bar
Reviewers asked for using operators in the search bar. I guess that is something to activate in Solr? We like to have "+" and "-" (and for experts maybe also "~"). I see that sentence-search is activated: "i only like to search for this sentence" works.
Are there any other operators that are available (I guess this is described in Solr documentation: https://lucene.apache.org/solr/guide/6_6/the-standard-query-parser.html ?) and we like to use? @matej.durco @lbarbot