title: Searching phone number object in Elasticsearch with C#
body: <p>I have an elasticsearch index that contains a phone number object with a contact document. The JSON is saved like this: </p>
  
  <pre><code>"contactId": "fd71b8e0-c3dd-4861-a45d-6917fdb48038",
  "phone": { "country": "123",
             "area": "202",
             "number": "4567"
            },
  "type": "business"
  </code></pre>
  
  <p>The mapping that is used in this document for the phone object is in the form:</p>
  
  <pre><code>,
        "phone": {
          "properties": {
            "area": {
              "type": "string"
            },
            "country": {
              "type": "string"
            },
            "number": {
              "type": "string"
            }
          }
        },
  </code></pre>
  
  <p>We're querying the index using a C# application that's implementing Nest. In the application we construct a <code>Nest SearchDescriptor</code> object that is used as part of the client call. How can I add to the <code>SearchDescriptor</code> to search for a phone number when the user is searching for a string like 1232024567?</p>