title: storing key value pair in multivalued field solr4.0
body: <p>i am using solr4.0. I want to store key value pairs of attributes in mutlivalued field.</p>
  
  <p>Example: I have some documents (Products) which have attributes as one field and i indexed 
  attributes as separate documents to power auto suggest . now in some auto suggest i have to show facet count of products also . For this i am using solr joins 4.0 and faceting on attributes. here i want to get the name and id of attributes. how i can achieve this?</p>
  
  <p>The Query is looks like below</p>
  
  <pre><code>localhost:8980/solr/searchapp/select?q=%7B!join+from=attr_id+to=prod_attr_id%7Dterms:red&amp;wt=json&amp;indent=true&amp;facet.field=prod_attr_id&amp;facet=true&amp;rows=1000&amp;fl=product_name,product_id
  </code></pre>