Bump elasticsearch from 5.4.0 to 6.8.15#25

dependabot[bot] wants to merge 1 commit intorelease/1.8data-integrations/elasticsearch-plugins:release/1.8from

dependabot/maven/org.elasticsearch-elasticsearch-6.8.15data-integrations/elasticsearch-plugins:dependabot/maven/org.elasticsearch-elasticsearch-6.8.15Copy head branch name to clipboard