Field [price] of type [text] is not supported for aggregation [avg]

{
    "properties":{
        "title":{
            "type": "text", // text 文本类型，可以分词
            "index": true
        },
        "category": {
            "type":"text", // keyword 关键词，必须是完整的，不能分词
            "index": true
        },
        "images": {
            "type": "text",
            "index": true
        },
        "price":{
            "type":"float",
            "index":true
        }
    }
}