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			- Upgrade elasticsearch-rest-client to 7.6.0. - Add V7_6 to the version manager, and use this in all the V7 tests. - Use the 7.6.0 image from blacktop in the test container; based on [1]. - Triggered by watching releases [2], which links to the release notes. [1] https://github.com/blacktop/docker-elasticsearch-alpine/pull/27 [2] https://github.com/elastic/elasticsearch/releases/tag/v7.6.0 Change-Id: I63e6c396b8c159b4ebdfe9817518f239fd62928c