I found a solution: I created a custom Search Handler and overridden 'handleRequestBody'. Then I modify the "getParams" collection within 'handleRequestBody' to enforce the fl param.
Sent with [ProtonMail](https://protonmail.com) Secure Email. > -------- Original Message -------- > Subject: Re: How to restrict the fields solr returns? > Local Time: 19 December 2017 1:02 PM > UTC Time: 19 December 2017 12:02 > From: rl...@leirtech.com > To: solr-user@lucene.apache.org > > The fl parameter is used for this. > > On December 19, 2017 3:22:59 AM EST, Solrmails solrma...@protonmail.com wrote: > >> Hey >> I'm using a custom "QParserPlugin" to restrict which documents are >> returned to the user. >> Now I'd like to restrict also the fields that are returned with a >> document. I couldn't find a good entry point to do such a restriction. >> Maybe I could missuse a "QueryResponseWriter" plugin but that sounds >> like a bad idea. >> Any other ideas? >> >> -- >> Sorry for being brief. Alternate email is rickleir at yahoo dot com