title: Getting score null in Elastic search
body: <pre><code>{"query":{"bool": {"must": {"match": {"query": ["java"] }}}}}, 
    "sort": {"_timestamp" : "desc"}}
  </code></pre>
  
  <p>executing above query I am getting <em>max_score</em> and <em>_score</em> is NULL like this</p>
  
  <pre><code> "max_score": null
  </code></pre>