title: ElasticSearch, how do I use "boost_terms" in MLT?
body: <p><a href="https://www.elastic.co/guide/en/elasticsearch/reference/1.6/query-dsl-mlt-query.html#_query_formation_parameters" rel="nofollow">https://www.elastic.co/guide/en/elasticsearch/reference/1.6/query-dsl-mlt-query.html#_query_formation_parameters</a></p>
  
  <p>lists <code>boost_terms</code> but don't show how we should use it..</p>
  
  <p>I failed to google it as well..</p>
  
  <p>I tried</p>
  
  <pre><code>"boost_terms" = {
  "field1": 3
  }
  
  "boost_terms" = ["field1"]
  "boost_terms" = [3]
  </code></pre>