dependency: bump elasticsearch-rest-client from 7.14.1 to 7.15.0 (#497)

Bumps [elasticsearch-rest-client](https://github.com/elastic/elasticsearch) from 7.14.1 to 7.15.0.
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v7.14.1...v7.15.0)

---
updated-dependencies:
- dependency-name: org.elasticsearch.client:elasticsearch-rest-client
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -408,7 +408,7 @@
         <dependency>
             <groupId>org.elasticsearch.client</groupId>
             <artifactId>elasticsearch-rest-client</artifactId>
-            <version>7.14.1</version>
+            <version>7.15.0</version>
         </dependency>
 
         <dependency>