Ensure govuk_elasticsearch manages repo
Ensure govuk_elasticsearch manages repo

By ensuring that the `govuk_elasticsearch` module manages the Apt
repository, we're making sure that we get the Elasticsearch binaries from
our own Apt repository rather than from further afield. This is good
because:

- if the source repository is ever unavailable, we have our own copy
- if the source files are ever removed, we have our own copy
- if the source files are ever corrupted, we have our own copy

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet