Remove unused background option from mongodb index creation.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.84%. Comparing base (8e94da6) to head (5cdcdaf).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   90.85%   90.84%   -0.01%     
==========================================
  Files           6        6              
  Lines        1443     1442       -1     
==========================================
- Hits         1311     1310       -1     
  Misses        132      132              

Files with missing lines	Coverage Δ
lib/resources.js	89.46% <100.00%> (-0.03%)	⬇️
lib/restrictions.js	93.22% <100.00%> (ø)

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