[{"userid":"5fab9a66c493dc4a3c49a7a3","name":"user name","acc":"admin","Blas":"00.00","Ntry":[{"Amt":"11.72","BookgDt":"2020-08-16",},{"Amt":"16.72","BookgDt":"2020-06-23",}]},{"userid":"5fab9a77c493dc4a3c49a7a3","name":"user name","acc":"user","Blas":"00.00","Ntry":[{"Amt":"11.72","BookgDt":"2020-08-23",},{"Amt":"16.72","BookgDt":"2020-07-23",}]}]

db.collection.find({$and:[{$expr:{$eq:[{$month:{$dateFromString:{dateString:"$Ntry.BookgDt",format:"%Y-%m-%d"}}},12]}},{$expr:{$eq:[{$year:{$dateFromString:{dateString:"$Ntry.BookgDt",format:"%Y-%m-%d"}}},2019]}},{$expr:{$eq:["id","5fab9a66c493dc4a3c49a7a3"]}}]})