cube.js support elasticsearch

es analysis of cube.js has supported the principle is based on sql, because the core is cube.js sql-based processing, so long as it is based on sql 
processing, are essentially based on cube.js can be extended, probably to see under the official by opendistro elasticsearch amazon to support 
because opendistro comes sql expansion, while the official processing sql-based sqlstring package, available at trial

Reference material

https://github.com/cube-js/cube.js/blob/master/packages/cubejs-elasticsearch-driver/driver/ElasticSearchDriver.js