title: equivalent JSON request for _search?q:value in elasticsearch
body: <p>Is there anyway to ask ES to explain a URL query like this one:</p>
  
  <pre><code>GET myindex/mytype/_search?q=something
  </code></pre>
  
  <p>Elasticsearch is returning undesired documents and don't know why.</p>
  
  <p>Is there a way of changing url request into a JSON request like:</p>
  
  <p>Note: syntax from marvel plugin.</p>
  
  <pre><code>GET myindex/mytype/_search
  { explain : true,
    query : {
      "q" : "something"
    }
  }
  </code></pre>