[CI] Use docker to launch Elasticsearch in rake task #803
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The purpose of this pull request is to use docker to launch Elasticsearch, instead of downloading and extracting the tarball.
Note: It is expected that the integration tests will fail, as the work in this pull request is necessary for the tests to pass on ES 6.x.
The tests against Rails 3.0 are also expected to fail. A separate pull request will be made to update the matrix.