Bump elasticsearch-rest-client from 5.6.15 to 6.8.15 in /elasticsearch5.x#29

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dependabot/maven/elasticsearch5.x/org.elasticsearch.client-elasticsearch-rest-client-6.8.15labazhou2018/elasticsearch:dependabot/maven/elasticsearch5.x/org.elasticsearch.client-elasticsearch-rest-client-6.8.15Copy head branch name to clipboard