我试图弄清楚More like this query（ES 2.X）的工作原理。我用术语向量创建了以下索引。

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"]
}

为什么以下查询没有返回结果？在第二个查询中，我希望至少检索doc 3，其值与doc 1相同。

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"
            }
         ]
      }
   }
}