Solr search page and custom filters I want to change the default sorting order of a pre-populated Solr search page (the option "Show enabled facets' blocks in their configured regions and first page of all available results" under "Behavior on empty search" of the Advanced Search Options). I thought the solution would be setting a custom filter but I cannot find the right syntax: I tried everything from "solrsort=ds_created:desc" to "sort=created:desc" and all the variants between... but I failed... Anyone may help me please?
Just a regular space seems to be working for me.  Add the following to the end of your search URL: "&amp;solrsort=ds_created desc".

Just to be sure though, you can always go to the following reports page, to make sure the ds_created field has been indexed.  You can see all the fields apachesolr has in its index there: /admin/reports/apachesolr

Let me know if that helps! 

============== EDIT ===================

Another option I've used is to create a small module that modifies my solr query and/or solr results... I actually set my default sorting in that module.  Here's a snippet of my code:

function YOURMODULE_apachesolr_query_alter(&amp;$query) {
  //Set the sort default options.  These are different options.  Just choose one!
  $query-&gt;setSolrsort('sort_label', 'asc');  // by title
  $query-&gt;setSolrsort('ds_created', 'desc');  // by created date
  $query-&gt;setSolrsort('score', 'desc');     // by best match
}


:-)  Hope that helps, since the above wasn't quite what you needed...