Bump elasticsearch from 2.3.2 to 6.8.15 in /kvs/YCSB/YCSB/elasticsearch#27

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dependabot/maven/kvs/YCSB/YCSB/elasticsearch/org.elasticsearch-elasticsearch-6.8.15ucbrise/anna:dependabot/maven/kvs/YCSB/YCSB/elasticsearch/org.elasticsearch-elasticsearch-6.8.15Copy head branch name to clipboard