Query for nested values, not documented.

Hi,

I'm hitting a brick wall here, so any help would be appreciated. I have data like this:

"_source": {
"ItemName": "test title 4",
"ItemBody": "The description",
"ItemAttributes": {
"colour": [
"blue",
"red"
],
"size": [
"s"
"m"
"l"
]
}
},

Is there a way to query this data, without using the dot notation, like I've tried (below). The dot is not a vilid field name, so the query doesn't work.

search(
body: {
query: {
match : { ItemAttributes.colour : "blue" }
}
}
)

Thanks in advance. Davey