title: Error on creation of a mapping for an index
body: <p>I am trying to change the mapping of an index, but getting an error.  Here are the steps I am taking to create the index</p>
  
  <ul>
  <li>create the index by populating it through a python script</li>
  <li><p>set the mapping with this code:</p>
  
  <pre><code>PUT /myidx/orderrow/_mapping
  {
      "orderrow": {
          "properties": {
              "item_code": {
                  "type": "string", 
                  "index": "not_analyzed"
              }
          }
      }
  }
  </code></pre></li>
  </ul>
  
  <p>Here's the error message I get:</p>
  
  <pre><code>{
     "error": "MergeMappingException[Merge failed with failures {[mapper [item_code] has different index values, mapper [item_code] has different `norms.enabled` values, mapper [item_code] has different tokenize values, mapper [item_code] has different index_analyzer]}]",
     "status": 400
  }
  </code></pre>
  
  <p>Any ideas?</p>