title: Mongo query on dynamic fields in embedded document
body: <p>I have the following structure :</p>
  
  <pre><code>{
     "FiledA" : "FiledAValue",
     "FiledB" : "FiledBValue",
     "FiledC" : {
            "X" : "XValue",
            "Y" : "YValue",
            "Z" : "ZValue"
     },
  }
  </code></pre>
  
  <ul>
  <li><strong>FiledC</strong> content may be dynamic (other fileds than x,y,z)</li>
  <li>The user will send a query like <code>{"FiledA" : "12" , "FiledC" : "333"}</code>
  The query should match 12 for FiledA and if there any FiledC which one of its filds contains 333</li>
  </ul>
  
  <p><strong>How I can solve the FiledC issue in  a query</strong> ?</p>
  
  <p>Thanks in advance ...</p>