This commit is the initial commit for a Go library providing an
idiomatic, easy-to-use query builder for ElasticSearch. The library can
build queries and execute them using the structures from the official Go
SDK provided by the ES project (https://github.com/elastic/go-elasticsearch).
The library currently provides the capabilities to create and execute
simple ElasticSearch queries, specifically Match queries (match,
match_bool_prefix, match_phrase and match_phrase_prefix), Match All
queries (match_all, match_none), and all of the Term-level queries (e.g.
range, regexp, etc.).
Unit tests are included for each support query, and the code is linted
using golangci-lint (see enabled linters in .golangci-lint). The unit
tests currently only verify the builder creates valid JSON queries and
does not attempt to actually run queries against a (mock) ES instance.