question: public String query ( String handler , SolrQueryRequest req ) throws Exception { try ( SolrCore core = getCoreInc ( ) ) { SolrQueryResponse rsp = new SolrQueryResponse ( ) ; SolrRequestInfo . setRequestInfo ( new SolrRequestInfo ( req , rsp ) ) ; core . execute ( core . getRequestHandler ( handler ) , req , rsp ) ; if ( rsp . getException ( ) != null ) { throw rsp . getException ( ) ; } StringWriter sw = new StringWriter ( 32000 ) ; QueryResponseWriter responseWriter = core . getQueryResponseWriter ( req ) ; responseWriter . write ( sw , req , rsp ) ; req . close ( ) ; return sw . toString ( ) ; } finally { req . close ( ) ; SolrRequestInfo . clearRequestInfo ( ) ; } }
target:  Processes a "query" using a user constructed SolrQueryRequest, and closes the request at the end.