Adding transaction support

[gsi-alejandro]

closes: #749, #741

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.17204% with 11 lines in your changes missing coverage. Please review.

Project coverage is 94.47%. Comparing base (369c827) to head (d5398ce).

:exclamation: Current head d5398ce differs from pull request most recent head 04193e3

Please upload reports for the commit 04193e3 to get more accurate results.

Files	Patch %	Lines
src/model/utils/update-refdoc-indexes.ts	60.00%	6 Missing :warning:
src/model/index/refdoc/build-index-refdoc.ts	58.33%	5 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #758      +/-   ##
==========================================
+ Coverage   93.20%   94.47%   +1.27%     
==========================================
  Files          96       96              
  Lines        2677     2732      +55     
  Branches      642      668      +26     
==========================================
+ Hits         2495     2581      +86     
+ Misses        182      151      -31     

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