fix: pin elasticsearch-py bellow 7.14

[dpgaspar]

Pin elasticsearch-py bellow 7.14: https://github.com/elastic/elasticsearch-py/releases/tag/v7.14.0

Issues: #70

[codecov-commenter]

Codecov Report

Merging #71 (3a72fff) into master (02959e9) will not change coverage.
The diff coverage is n/a.

❗ Current head 3a72fff differs from pull request most recent head 59ee0cc. Consider uploading reports for the commit 59ee0cc to get more accurate results

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files          15       15           
  Lines         956      956           
=======================================
  Hits          905      905           
  Misses         51       51           

Flag	Coverage Δ
python	94.66% <ø> (ø)

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