title: Trouble with spaces in query to elasticsearh
body: <p>I'm experiencing trouble with requesting fileds making requests on field with spaces. Mapping looks like this:</p>
  
  <pre><code>"myIndexName": {
      "mappings": {
          "myType": {
              "properties": {
                  "myPropertyWithSpaces": {
                      "type": "string",
                      "analyzer": "analyzer_keyword"
                  }
              }
          }
      }
  }
  </code></pre>
  
  <p>There "analyzer_keyword" is cutom analyzer with keyword tokenizer and lowercase filter.
  When I'm sending "_analyze" request with "analyzer_keyword" analyzer and query like "firstWord secondWord" I get only token "firstword secondword" - everything works as expected. But querystring request returns nothing if I don't change space character to "?" wildcard; interesting, that lowercasing still works and such behaviour doesn't change if I'm telling elasticsearch to use this "analyzer_keyword" explicitly.</p>
  
  <pre><code>"query": {
  "query_string": {
      "query": "firstWord secondWord",
      "default_field": "myPropertyWithSpaces",
      "analyzer": "analyzer_keyword"
  }
  </code></pre>