Return record instead of using mongodb return value.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.55%. Comparing base (4ea8fbb) to head (cb155b0).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   92.49%   92.55%   +0.06%     
==========================================
  Files          12       12              
  Lines        3463     3534      +71     
==========================================
+ Hits         3203     3271      +68     
- Misses        260      263       +3     

Files with missing lines	Coverage Δ
lib/batchVersions.js	87.82% <100.00%> (-0.08%)	⬇️
lib/documents.js	92.36% <100.00%> (-0.02%)	⬇️
lib/tokens/batches.js	93.19% <100.00%> (-0.01%)	⬇️
lib/tokens/pairwise.js	83.18% <100.00%> (+2.83%)	⬆️

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