updated to work with elasaticsearch 7 as well as 6

updated for elasaticsearch client 6.1 and Scout 7.0

Merge pull request #39 from brino/9.0

added size method to builder

Merge pull request #38 from brino/9.0

Added composite aggregation, and change to aggregation() method in builder

Merge pull request #36 from brino/9.0

added secondary default query to "match_all" if empty search given

Merge pull request #35 from brino/9.0

bugfix

Merge pull request #34 from brino/9.0

reworked default query so that where() also works as a filter

Merge pull request #33 from brino/9.0

compatibility for scout 5 and 6

Use suggested mapping type

required v6 of elasticsearch api