Build(deps): Bump elasticsearch-rest-client from 6.2.3 to 6.8.15 in /data-pipeline/es-client#36

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dependabot/maven/data-pipeline/es-client/org.elasticsearch.client-elasticsearch-rest-client-6.8.15EkStep-DevCon-2020/devcon-data-pipeline:dependabot/maven/data-pipeline/es-client/org.elasticsearch.client-elasticsearch-rest-client-6.8.15Copy head branch name to clipboard