Answers for "mongodb export change field name"

update field name in mongodb

// false,true is set for =>{upsert:false, multi:true}
db.foo.update({}, {$rename:{"name.additional":"name.last"}}, false, true);

mongodb rename database

# Dump db to a local folder
mongodump mongodb://user:pwd@localhost/old_name -o ./dump 

# Restore the db with the new name
mongorestore mongodb://user:pwd@localhost -d new_name ./dump/old_name

# Then run these commands in your mongodb shell
use old_name
db.dropDatabase()