How to copy some ElasticSearch data to a new index

Let's say I have movie data in my ElasticSearch and I created them like this:

curl -XPUT "http://192.168.0.2:9200/movies/movie/1" -d'
{
    "title": "The Godfather",
    "director": "Francis Ford Coppola",
    "year": 1972
}'

And I have a bunch of movies from different years. I want to copy all the movies from a particular year (so, 1972) and copy them to a new index of "70sMovies", but I couldn't see how to do that.

Solution

Since ElasticSearch 2.3 you can now use the built in _reindex API

for example:

POST /_reindex
{
  "source": {
    "index": "twitter"
  },
  "dest": {
    "index": "new_twitter"
  }
}

Or only a specific part by adding a filter/query

POST /_reindex
{
  "source": {
    "index": "twitter",
    "query": {
      "term": {
        "user": "kimchy"
      }
    }
  },
  "dest": {
    "index": "new_twitter"
  }
}