title: Nest - how to write a span near query with multiple clauses?
body: <p>I want to use NEST to write a query as described in:
  <a href="https://www.elastic.co/guide/en/elasticsearch/reference/1.7/query-dsl-span-near-query.html" rel="nofollow">https://www.elastic.co/guide/en/elasticsearch/reference/1.7/query-dsl-span-near-query.html</a></p>
  
  <p>I have a collection of values to use as a SpanTerm clause. The collection size varies by query.</p>
  
  <p>If the collection size was limited I could do:</p>
  
  <pre><code>var sn = q.SpanNear(snr =&gt; snr.Clauses(c =&gt; c.SpanTerm(), c =&gt; c.SpanTerm(), ...))
  </code></pre>
  
  <p>How do I do it dynamically (unknown clauses count)?</p>