Elasticsearch - Result formatting differences

A recent change to conform with elaastic.co result formatting (to cope with json result) is not compatible with open distro/aws es sql result formatting. In open distro case, json formatting is more like the standard es result format whereas json format in elastic.co is more like a jdbc format.

This is the offending code.
https://github.com/cube-js/cube.js/blob/c1e25d7184c5ed63ba083da1cd9cf0f2111b8011/packages/cubejs-elasticsearch-driver/driver/ElasticSearchDriver.js#L86

We perhaps need to split the driver in some way - either entirely or certainly the query and driver.

I am happy to look at PR for this

**To Reproduce**
setting result format to json while using awses/open distro - json result formatting results in an exception

**Expected behavior**
Both open distro and elastic.co should be supported either via single driver or multiple

**Version:**
latest