Mongodb

Find all documents against array fields which matches any of the input Suppose, I have a collection "StockUsers" like this. {     "user":"kiran",     "stocksPurchased":["hdfc","sbi","icici"] } {     "user":"vanaja",     "stocksPurchased":["hdfc","idbi","pnb"] } {     "user":"karthika",     "stocksPurchased":["idfc","idbi"] } {     "user":"venkat",     "stocksPurchased":["citi"] } Now, If i want to query the users who purchased any of the given stocks. Ex: Retrieve all users who purchased idfc or pnb Query: db.StockUsers.aggregate([ {    "$match": {        "stocksPurchased": {"$elemMatch":{"$in":["idfc","pnb"]}}    } } ]) Response: {     "user":"vanaja...