title: Elastic Search: ngram filter with aggregation
body: <p>Is there any way to surpass the nGram filter when doing an aggregation? </p>
  
  <p>i have a defined ngram filter with :</p>
  
  <pre><code> "ngram_filter": {
            "type": "ngram",
            "min_gram": "1",
            "max_gram": "100"
          }
  </code></pre>
  
  <p>and i want to a an aggregation on a field with this filter defined on it:</p>
  
  <p>i get the buckets result filtered:</p>
  
  <pre><code>   "buckets": [
          {
            "key": "_",
            "doc_count": 394
          },
          {
            "key": "a",
            "doc_count": 365
          },
          {
            "key": "m",
            "doc_count": 357
          },
          {
            "key": "i",
            "doc_count": 344
          },
          {
            "key": "_d",
            "doc_count": 341
          },
          {
            "key": "d",
            "doc_count": 341
          },
          {
            "key": "e",
            "doc_count": 319
          },
          {
            "key": "r",
            "doc_count": 289
          },
          {
            "key": "l",
            "doc_count": 260
          },
          {
            "key": "l_",
            "doc_count": 221
          }
      ]
  </code></pre>
  
  <p>also i do not want to change the ngram analyzer...</p>