The requirements.txt file lists `5.5.3` as the minimum version for elasticsearch. Official SQL support landed in elasticsearch as of `6.3.0`. It seems like this PR is still predicated on 5.5.3? Much like its [predecessor](https://github.com/apache/incubator-superset/pull/2953)? With perhaps an attempt to map the SQL coming in the SQL alchemy api without relying on the new sql[ _translate endpoint](https://www.elastic.co/guide/en/elasticsearch/reference/current/sql-translate.html)? If that's the intent here, I think it would be smart to focus solely on ES 6.3.0+ -- am I understanding this correctly?
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