Serialize the reading of the partial vocabularies during the merge phase

[joka921]

We still have to figure out the correctness and performance implications.

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4beb5c1) 87.30% compared to head (dccfb97) 87.31%.

Files	Patch %	Lines
src/index/VocabularyGeneratorImpl.h	95.65%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1240   +/-   ##
=======================================
  Coverage   87.30%   87.31%           
=======================================
  Files         304      304           
  Lines       27470    27488   +18     
  Branches     3096     3098    +2     
=======================================
+ Hits        23982    24000   +18     
  Misses       2364     2364           
  Partials     1124     1124           

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[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions

B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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