title: Elasticsearch More Like this no result
body: <p>I'm trying to figure out how does More like this query works (ES 2.X).
  I have created the following index with term vector.</p>
  
  <pre><code>PUT /test_index
  {
     "settings": {
        "number_of_shards": 1,
        "number_of_replicas": 0
     },
     "mappings": {
        "doc": {
           "properties": {
              "text": {
                 "type": "string",
                 "term_vector": "yes"
              }
           }
        }
     }
  }
  
  PUT /test_index/doc/1
  {
      "text": ["Hello","World"]
  }
  
  PUT /test_index/doc/2
  {
      "text": ["This","is","me"]
  }
  
  PUT /test_index/doc/3
  {
      "text": ["Hello","World"]
  }
  
  PUT /test_index/doc/4
  {
      "text": ["Hello","World","World"]
  }
  </code></pre>
  
  <p>Why do the following queries returns no result? With the second query I expected to retrieve at least doc 3, which has the same values of doc 1.</p>
  
  <pre><code>POST /test_index/doc/_search
  {
     "query": {
        "more_like_this": {
           "like": "Hello",
           "min_term_freq": 1
        }
     }
  }
  
  POST /test_index/doc/_search
  {
     "query": {
        "more_like_this": {
           "fields": [
              "text"
           ],
           "like": [
              {
                 "_index": "test_index",
                 "_type": "doc",
                 "_id": "1"
              }
           ]
        }
     }
  }
  </code></pre>