title: Solr multiple facet dates
body: <p>According to the <a href="http://wiki.apache.org/solr/SimpleFacetParameters#Date_Faceting_Parameters" rel="noreferrer">Apache Solr documentation on facets</a>, I can use keys because: 'This can be helpful when faceting on the same field multiple times with different exclusions.'</p>
  
  <p>I need them because I want to have a facet that gives me 'Last day', 'Last week', 'Last month' options.</p>
  
  <p>However, when I specify a query with the following options set:</p>
  
  <pre><code>http://URL/select?
  ...unrelated...
  facet=true&amp;
  facet.date={!key=some_key}created&amp;
  f.some_key.facet.date.start=NOW/DAY-1DAY&amp;
  f.some_key.facet.date.end=NOW/DAY&amp;
  f.some_key.facet.date.gap=NOW/DAY+1DAY
  ...unrelated...
  </code></pre>
  
  <p>Solr complains about:</p>
  
  <blockquote>
    <p>[exception] =>
    org.apache.solr.common.SolrException:
    Missing required parameter:
    f.created.facet.date.start (or
    default: facet.date.start)</p>
  </blockquote>
  
  <p>When I set facet.date.start, or f.created.facet.date.start, they will override the fields of my some_key (start/end/gap) and this is useless because I need multiple keys... Can anyone point me in the right direction here? Due to limitations of the library I am using, this needs to be done in a single query.</p>