title: ElasticSearch boosting score with external system
body: <p>I would like to integrate ElasticSearch with external system, over http/rest, for boosting score. I'm not ElasticSearch developer and I don't have too much experience with ElasticSearch.</p>
  
  <p>I can use Native Script for that, but there is a problem with performance. Because for each document I need to call external system. What I would like to see is some kind of batch processing.</p>
  
  <p>I don't want to store information from external system in ElasticSearch, because they could change in time.</p>
  
  <p>Could you please advise me, how to do that?</p>
  
  <p>Also I didn't find much information (documentation) about custom native scripts or plugins. Just project on GitHub.</p>