Add support for search_type parameter

[dadoonet]

Let say I want to run the following query in elasticsearch:

GET .bano/_search?search_type=dfs_query_then_fetch
{
  "size": 1,
  "query": {
     "match": {
       "foo": "bar"
     }
  }
}

I can't specify the search_type parameter in this elasticsearch plugin.
Would be nice to add a support for it.

[woodchalk]

+1

[sethyes]

+1, I'm trying to get the _count functionality to work..