title: Elasticsearch match containg Umlaut does not work
body: <p>I have the following query:</p>
  
  <pre><code>res = es.search(index="index", body={"query": {
      "bool" : {
          "must" : {
              "match" : { "text" : "Flüchtl*" }
          },
          "filter": {
              "range" : { "publish_date" : {"gte": "2015-08-30 00:00:00", "lt": "2016-01-01 00:00:00"}
              }
          }
      }
  }}, size=10000)
  </code></pre>
  
  <p>When I do this query in Kibana, I get 3071 results, however when I do this with the Python library, I get zero results. When I use words that do not contain Umlaute, everything works fine. What am I doing wrong?</p>