Bump elasticsearch from 5.6.3 to 6.8.13 in /demo/demo-introducing-machine-learning/demo-listener#25

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dependabot/maven/demo/demo-introducing-machine-learning/demo-listener/org.elasticsearch-elasticsearch-6.8.13flowable/flowable-examples:dependabot/maven/demo/demo-introducing-machine-learning/demo-listener/org.elasticsearch-elasticsearch-6.8.13Copy head branch name to clipboard