title: How to print SearchRequest
body: <p>I'm trying to validate filter generation logic, so I have an instance of SearchRequest, but how to get a String representation of it ?</p>
  
  <p>I don't have SearchResponse, only SearchRequest since I'm simply capturing it in my test.</p>
  
  <p><a href="https://stackoverflow.com/questions/29376817/elasticsearch-nest-query/31247636#31247636">This</a> doesn't compile "Can't convert from NestSearchRequest" to byte[].
  <a href="https://stackoverflow.com/questions/23703570/is-there-a-way-to-deserialize-elasticsearch-nest-search-query">This</a> doesn't work either, there is no Client class in Nest and ElasticClient doesn't have Serializer property (Nest 1.6.0/Elasticsearch 1.6.1).</p>