Add more features to elasticsearch

[yii-bot]

This issue has originally been reported by @cebe at yiisoft/yii2#1313.
Moved here by @cebe.

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To make elasticsearch support complete.

Moved these from #1295 as we can easily add them later and they are nice to have.

• make use of native optimistic locking support
• implement versioning
• api to retrieve parents and children (see also elasticsearch can not update active record that has a parent relation yii2#5758 (comment))
• make index and type available in instantiate (#2289)
• implement updateAllCounters(), see for details Update API: Allow to update a document based on a script elastic/elasticsearch#1583
• implement copy() and move() as PK change is not supported

[githubjeka]

Good job bot. :)

[beowulfenator]

This will be more useful in 2.1