term suggest test

PUT /test_items
{
    "mappings": {
        "item": {
            "properties": {
                "name_suggest": {
                    "type": "keyword"
                }
            }
        }
    }
}

POST /test_items/item
{
    "name_suggest": [ "foo" ]
}

POST /test_items/item
{
    "name_suggest": [ "bar" ]
}

POST /test_items/item
{
    "name_suggest": [ "foo", "foot", "foo foot"  ]
}

// Expects results "foo", "foot" and "foo foot" but I get none
POST /test_items/item/_search
{
    "suggest": {
        "name_suggest": {
            "text": "foo",
            "term": {
                "field": "name_suggest",
                "min_word_length": 1           
            }
        }
    }
}