In teh future, please direct questions like this about "using" solr to the solr-user list ... it has more subscribers so there are more people to offer advice.
: For the sake of performance, I want to suppress output of <arr : name="features"> which inside <doc>. But <lst name="highlighting"> need : to be reserved. just specify an "fl" list which doesn't inlcude "features" ... there is no way to turn off the entire <result> block, but you can specify an "fl" of only one field (your uniqueKey perhaps?) to keep the output small. (Perhaps we should add an hl.rows param which defaults to the value of "rows" .. that way people that only care about highlighting can say "...&rows=0&hl.rows=10&..." ?) -Hoss
