title: Clear all FilterQuery in Sitecore.ContentSearch linq query
body: <p>I can do solr query with</p>
  
  <pre><code>var index = ContentSearchManager.GetIndex(IndexName);
  var context = index.CreateSearchContext()
  var results = context.GetQueryable&lt;SolrCoreModel&gt;().GetResults()...
  </code></pre>
  
  <p>but there's always added in raw solr query fq parameter with indexname</p>
  
  <pre><code>&amp;fq=_indexname:(solr_core)
  </code></pre>
  
  <p>How can I remove it and send 'clear' query?</p>