db.yourCollection.find( { array: "element" } )
db.articles.find({ "stock.country" : "01", "stock.warehouse.code" : "02" }).pretty();
// Finds all documents that have a property named "tags" // which has at least one array element matching "red" db.inventory.find( { tags: "red" } )
db.inventory.find( { tags: ["red", "blank"] } )