Update Elasticsearch to 7.7.0
What does this Merge Request do?
Update elasticsearch to 7.7.0, which is the newer of the two major versions (6 & 7) that we currently support.
Closes #824 (closed)
Merge Request checklist
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Tests added for new functionality. If not, please raise Issue to follow-up. -
This change is backward compatible. If not, please include steps to communicate to our users. -
Documentation added/updated, if needed. -
gdk doctor
test added, if needed.
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