Bump elasticsearch from 5.6.3 to 6.8.17 in /demo/demo-introducing-machine-learning/demo-listener#37

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dependabot/maven/demo/demo-introducing-machine-learning/demo-listener/org.elasticsearch-elasticsearch-6.8.17flowable/flowable-examples:dependabot/maven/demo/demo-introducing-machine-learning/demo-listener/org.elasticsearch-elasticsearch-6.8.17Copy head branch name to clipboard