Database
[{_id:1,"ips":{"127.0.0.1":1}},{_id:2,"ips":{"127.0.0.1":100,"192.168.0.1":50}}]
Query
db.collection.update({},[{$set:{ips:{$setField:{field:"127.0.0.1",input:"$ips",value:{$add:[{$getField:{field:"127.0.0.1",input:"$ips"}},1]}}}}}],{multi:true})