[ci] updated Elasticsearch versions in CI and docs #209
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it's been two months since we updated versions we test against (#204 ). This PR does that again. Just two changes in this one:
6.8.6
-->6.8.8
+ 7.6.2
(previous latest was7.5.2
)This is the page I use to find what versions have been released: https://www.elastic.co/downloads/past-releases#elasticsearch