CMS-8434 [SolrContentSearchTool] Allow facets on boolean fields
see https://issues.apache.org/jira/browse/SOLR-7264 for docValues on BoolField (wait for the upgrade of Solr version)
see https://issues.apache.org/jira/browse/SOLR-7264 for docValues on BoolField (wait for the upgrade of Solr version)