fix ES signature length

[cristaloleg]

No description provided.

[codecov]

Codecov Report

Merging #56 into master will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
- Coverage   86.42%   86.34%   -0.09%     
==========================================
  Files          13       13              
  Lines         501      498       -3     
==========================================
- Hits          433      430       -3     
  Misses         40       40              
  Partials       28       28              

Impacted Files	Coverage Δ
algo_es.go	77.46% <100.00%> (-0.92%)	⬇️

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