Bump elasticsearch from 5.6.2 to 6.8.15 in /CDM-MODEL-SEARCH#9

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dependabot/maven/CDM-MODEL-SEARCH/org.elasticsearch-elasticsearch-6.8.15OHNLPIR/OMOP_CDM_IO:dependabot/maven/CDM-MODEL-SEARCH/org.elasticsearch-elasticsearch-6.8.15Copy head branch name to clipboard