Bump elasticsearch from 2.1.2 to 6.8.15 in /elasticsearch#15

dependabot[bot] wants to merge 1 commit intomasterthushear/ArchitectureOfJava:masterfrom

dependabot/maven/elasticsearch/org.elasticsearch-elasticsearch-6.8.15thushear/ArchitectureOfJava:dependabot/maven/elasticsearch/org.elasticsearch-elasticsearch-6.8.15Copy head branch name to clipboard