title: Search for a match within a collection with elasticsearch & NEST
body: <p>I'm really new to elasticsearch and NEST, so sorry for the basic question.<br/>
  I'm trying to find out how i can search for all documents that have a match in a collection property.</p>
  
  <p>My elastic document object looks something like this :<br/></p>
  
  <pre><code>[ElasticType(Name="my_document")]
  public class MyDocument
  {
      public long Id { get; set; }
      public long[] TagIds { get; set; }
  }
  </code></pre>
  
  <p>I would like to know how i search for documents that their <code>TagIds</code> property have a certain number in them.</p>
  
  <p>I would like to do something like this :</p>
  
  <pre><code>elasticClient.Search&lt;MyDocument&gt;(x =&gt;
          x.Query(s =&gt; s.Terms(z =&gt; z.TagIds.Contains(searchVal))));
  </code></pre>