fix: upgrade @elastic/elasticsearch from 7.9.1 to 7.15.0

Snyk has created this PR to upgrade @elastic/elasticsearch from 7.9.1 to 7.15.0.

See this package in npm:
https://www.npmjs.com/package/@elastic/elasticsearch

See this project in Snyk:
https://app.snyk.io/org/jswheeler/project/dd4862d9-38c6-40ad-b9e4-0a30b3d585bd?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -10,7 +10,7 @@
   "author": "lazybaer <[email protected]>",
   "license": "ISC",
   "dependencies": {
-    "@elastic/elasticsearch": "^7.9.1",
+    "@elastic/elasticsearch": "^7.15.0",
     "aws-sdk": "^2.771.0",
     "axios": "^0.20.0",
     "config": "^3.3.1",