Elasticsearch inner_hits query results in ArrayOutOfBoundsException

[Marius De Wit]

Hi all! Im currently trying to use the inner_hits functionality that was 
added in elasticsearch 1.5. Unfortunately, elastic is throwing an 
ArrayOutOfBoundsException when running my query. I would be very grateful 
if someone can have a look and tell me what I am doing wrong, as I feel 
that I have followed the documentation correctly. 

Example that produces the problem:

curl -XPOST 'http://localhost:9200/twitter'

curl -XPOST 'http://localhost:9200/twitter/_mapping/tweet' -d '
{
    "tweet": {
        "properties": {
            "comments": {
                "properties": {
                    "messages": {
                        "type": "nested",
                        "properties": {
                            "message": {
                                "type" : "string", 
                                "index": "not_analyzed"
                            }   
                        }
                    } 
                }
            }
        }
    }
}'

curl -XPOST 'http://localhost:9200/twitter/tweet' -d '
{
    "comments": {
        "messages": [
            {"message": "Nice website"},
            {"message": "Worst ever"}
        ]
    }
}'

curl -XGET 'http://localhost:9200/twitter/tweet/_search' -d '
{
    "query": {
        "nested": {
            "path": "comments.messages",
            "query": {
                "match": {"comments.messages.message": "Nice website"}
            },
            "inner_hits" : {}
        }
    }
}'

Response:

{"took":54,"timed_out":false,"_shards":{"total":5,"successful":4,"failed":1,"failures":[{"index":"twitter","shard":4,"status":500,"reason":"ArrayIndexOutOfBoundsException[-1]"}]},"hits":{"total":1,"max_score":1.4054651,"hits":[]}}

Note that the query will work if I take "inner_hits" out.

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