Exclude extraction of config/elasticsearch.yml

What does this merge request do and why?

When a new version of Elasticsearch is downloaded, the Makefile previously extracted elasticsearch/config/elasticsearch.yml, overwriting the templated version that the GDK manages. We should omit this file so that the templated settings are preserved to prevent issues with settings being changed.

Relates to #1637 (closed)

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.