Elasticsearch inner_hits query results in ArrayOutOfBoundsException

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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