[MongoDB]: Aggregation with $unwind for querying subdocuments in an Array

[ root @ dbvesitydotcom : ~ ] mongo MongoDB shell version: 2.6.5 connecting to: test > > > use dbversity_db switched to db dbversity_db > > db.mycol.insert({L1F1:”val1″,L1F2:[{L2F1:”val2″,L2F2:”val3″,L2F3:[{L3F1:”val50″, L3F2:”val51″,L3F3:”val52″},{L3F1:”val53″, L3F2:”val54″,L3F3:”val55″}]},{L2F4:”val4″,L2F5:”val5″}]}) WriteResult({ “nInserted” : 1 }) > > > db.mycol.find().pretty() {        …