Bump elasticsearch-rest-client from 6.2.3 to 6.8.15 in /springboot-elasticsearch#47

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dependabot/maven/springboot-elasticsearch/org.elasticsearch.client-elasticsearch-rest-client-6.8.15qinxuewu/boot-cloud:dependabot/maven/springboot-elasticsearch/org.elasticsearch.client-elasticsearch-rest-client-6.8.15Copy head branch name to clipboard