[{_id:1,timezone:"America/New_York",message:"Step 1: Started",details:[{name:"A",date:"2017-02-08T12:10:40.787",location:"BLR11"},{name:"B",date:"2017-09-09T12:10:40.787",location:"BLR12"}]},{_id:2,message:" Step 1: Ended ",details:[{name:"E",date:"2017-05-08",location:"BLR31"}]},{_id:3,date:"2017-02-09",timezone:"Europe/London",message:"Step 2: Started",details:[{name:"E",date:"2017-05-08",location:"BLR11"}]},{_id:4,date:"2017-02-09T03:35:02.055",timezone:"+0530",message:"Step 2: In Progress"}]

db.collection.find({"details.location":"BLR11"})