$params['body']['query']['bool']['must'][] = [
"multi_match" => [
"query" => $keyword,
"fields" => ["zwk_bumen", "zwk_kslx","zwk_yrsj", "zwk_zw"]
]
];
原文参考：https://www.elastic.co/guide/cn/elasticsearch/guide/current/_most_important_queries.html