Getting the same search result twice

[Joe_Y]

I have this query:

POST /contents/post/_search

{
"query" : {
"match": {
"postMessage": "game of thrones"
}
},
"size": 10
}

I'm getting several results but two of them have the same id and they're
the same exact document (as seen below).
On what terms can this happen?

• JSON http://jsonviewer.stack.hu/#
• took : 5 http://jsonviewer.stack.hu/#
  • timed_out : false http://jsonviewer.stack.hu/#
  • _shards http://jsonviewer.stack.hu/#
  • hits http://jsonviewer.stack.hu/#
  • total : 7 http://jsonviewer.stack.hu/#
    • max_score : 4.9791126 http://jsonviewer.stack.hu/#
    • hits http://jsonviewer.stack.hu/#
    • 0 http://jsonviewer.stack.hu/#
      • 1 http://jsonviewer.stack.hu/#
      • _index : "contents" http://jsonviewer.stack.hu/#
        • _type : "post" http://jsonviewer.stack.hu/#
        • _id : "d80ba3a142a049daa9d7307bed06a531"http://jsonviewer.stack.hu/#
        • _score : 3.1055753 http://jsonviewer.stack.hu/#
        • _source http://jsonviewer.stack.hu/#
        • 2 http://jsonviewer.stack.hu/#
      • _index : "contents" http://jsonviewer.stack.hu/#
        • _type : "post" http://jsonviewer.stack.hu/#
        • _id : "d80ba3a142a049daa9d7307bed06a531"http://jsonviewer.stack.hu/#
        • _score : 3.045415 http://jsonviewer.stack.hu/#
        • _source http://jsonviewer.stack.hu/#
        • 3 http://jsonviewer.stack.hu/#
      • 4 http://jsonviewer.stack.hu/#
      • 5 http://jsonviewer.stack.hu/#
      • 6 http://jsonviewer.stack.hu/#

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