Delete unused indexes created in mongodb

[ka1fe1]

There are some indexes which never used by query in Mongodb, but these indexes will slow down the speed of insert, update and delete operation. so, there have need to delete these indexes

[weichang-x]

db.tx_common.dropIndex("from");
db.tx_common.dropIndex("to");
db.ex_power_change.drop();
db.ex_uptime_change.drop();
db.ex_config.dropIndex({"env_nm": 1, "chain_id": 1}, {"unique": true, "background": true});
db.ex_config.createIndex({"env": 1, "chain_id": 1}, {"unique": true, "background": true});