1takes2

Delete unused indexes created in mongodb

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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...

can optimize these sql by follow methods: - change query logic or find other way to accomplish the aim - add indexes Ref: [collscan sql in explorer backend](http://wiki.bianjie.ai/pages/viewpage.action?pageId=15534159)

official documents: [Elasticsearch 7.4](https://www.elastic.co/guide/en/elasticsearch/reference/current/elasticsearch-intro.html)

fill validator commission rate value for history editValidator tx

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Ref irisnet/irishub-sync#163