[ElasticSearch-Spark] [SQL] Passing pushed down filters to elastic search

While reading through the source of ES Spark integration, I realized that
integration doesn't make use of SQL filter pushdowns. I have made an
initial attempt at making it work and things look pretty encouraging. I
have open a github issue
(https://github.com/elastic/elasticsearch-hadoop/issues/442) and have
mentioned some doubts that I am having regarding approach. It would be
great if someone can help me by responding to my queries on github.

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