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 92.65%. Comparing base (8ebdfda) to head (4eda52d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
+ Coverage   92.24%   92.65%   +0.40%     
==========================================
  Files          12       12              
  Lines        3534     3527       -7     
==========================================
+ Hits         3260     3268       +8     
+ Misses        274      259      -15     

Files with missing lines	Coverage Δ
lib/batchVersions.js	87.82% <100.00%> (ø)
lib/documents.js	92.50% <100.00%> (+0.13%)	⬆️
lib/entities.js	96.22% <100.00%> (+1.57%)	⬆️
lib/tokens/batches.js	93.30% <100.00%> (+0.62%)	⬆️
lib/tokens/pairwise.js	83.33% <100.00%> (+0.15%)	⬆️

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