KeywordCompleteMetadataFilter

对 yiask_learned 元数据的筛选，与应用于底表的 dataFilter 不同。

{
    "schema": {
        "$in": [
            "string"
        ],
        "property1": "string",
        "property2": "string"
    },
    "field": {
        "$notEmpty": true,
        "$in": [
            "string"
        ],
        "property1": "string",
        "property2": "string"
    },
    "property1": "string",
    "property2": "string"
}