title: Failed to derive xcontent from org.elasticsearch.common.bytes.BytesArray@0
body: <p>My curl query works </p>
  
  <p><code>curl -v -XGET 'http://localhost:9200/entityitem/5/_mget' -d '{"ids" : ["5000027585", "5000027615"]}'</code></p>
  
  <p>but when I use the rest client to do GET query</p>
  
  <p><code>http://localhost:9200/entityitem/5/_mget?source={"ids" : ["5000027585", "5000027615"]}</code></p>
  
  <p>I get the following error</p>
  
  <blockquote>
    <p>Failed to derive xcontent from org.elasticsearch.common.bytes.BytesArray@0</p>
  </blockquote>