Bump elasticsearch from 7.15.1 to 7.15.2 (#2622)

Bumps [elasticsearch](https://github.com/elastic/elasticsearch-py) from 7.15.1 to 7.15.2.
- [Release notes](https://github.com/elastic/elasticsearch-py/releases)
- [Commits](https://github.com/elastic/elasticsearch-py/compare/v7.15.1...v7.15.2)

---
updated-dependencies:
- dependency-name: elasticsearch
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

extra-nlp-requirements.txt

@@ -1,4 +1,4 @@
-elasticsearch==7.15.1
+elasticsearch==7.15.2
 gensim==4.1.2
 nltk==3.6.5
 pyemd==0.5.1