|-
{
"buyername":"北京华联"
}

import org.bson.Document
var result =mongo.database("business").collection("pjc_px_bak").aggregate(Arrays.asList(new Document("$match", 
    new Document("ITEM", "800074165"))))
for (item in result.iterator()) {
    log.info("输出")
    log.info(item['ITEM'])
}
return result.iterator().arrayLikeToList()