title: Elasticsearch: disable coordination factor for multi match query
body: <p>I use a multi match query with different weights on each field.
  I set tie_breaker to 1 to disable use_dis_max and use the sum instead of the max for the score.</p>
  
  <pre><code>GET index_name/index_type/_search?explain
  {
   "size": 1,
    "query": {
    "multi_match": {
     "query": "ticket",
     "fields": ["title^9", "descr^4", "*section_body"],
     "tie_breaker": 1
    }
   }
  }
  </code></pre>
  
  <p>ES sums the scores for each field then multiplies it by the coordination factor.</p>
  
  <p>I want to disable the coordination factor, so I tried to wrap my multi match query into a bool query and set disable_coord to true as the following:</p>
  
  <pre><code>GET index_name/index_type/_search?explain
  {
    "size": 1,
    "query": {
      "bool": {
         "disable_coord": true,
         "should": [
           {
            "multi_match": {
            "query": "ticket",
            "fields": ["title^9", "descr^4", "*section_body"],
            "tie_breaker": 1
             }
           }
        ]
      }
   }
  }
  </code></pre>
  
  <p>But I can see that nothing changed in the scoring formula, ES is still summing the scores for all different fields then multiplying the result by the coordination factor. </p>
  
  <p>How can I disable the coordination factor ?</p>