title: about ElasticSearch jdbc river
body: <p><strong>In my MySQL:</strong></p>
  
  <pre><code>mysql&gt; select * from cc;
  +----+------+
  | id | name |
  +----+------+
  |  1 | aa   |
  |  2 | bb   |
  +----+------+
  2 rows in set (0.00 sec)
  </code></pre>
  
  <p><strong>and elasticsearch jdbc river is:</strong></p>
  
  <pre><code>curl -XPUT 'localhost:9201/_river/my_jdbc_river/_meta' -d '{
      "type" : "jdbc",
      "jdbc" : {
          "driver" : "com.mysql.jdbc.Driver",
          "url" : "jdbc:mysql://localhost:3301/test",
          "user" : "root",
          "password" : "root",
      "poll" : "10s",
      "strategy" : "simple",
          "sql" : "select * from cc"
      }
  }'
  </code></pre>
  
  <p><strong>but,I don't understand elasticsearch index data why result is:</strong></p>
  
  <pre><code>aa
  bb
  aa
  bb
  aa
  aa
  aa
  bb
  bb
  bb
  </code></pre>
  
  <p><strong>I think result like this:</strong></p>
  
  <pre><code>aa
  bb
  </code></pre>
  
  <p>please help me, and thanks gsc-leticia help me format this question content.</p>