add top n recommenders to candidates

[zhenghaoz]

[codecov[bot]]

Codecov Report

Patch coverage: 81.48% and project coverage change: -0.09 :warning:

Comparison is base (a4bb5e3) 69.91% compared to head (127a9fc) 69.83%.

:exclamation: Current head 127a9fc differs from pull request most recent head 97a5aae. Consider uploading reports for the commit 97a5aae to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #688      +/-   ##
==========================================
- Coverage   69.91%   69.83%   -0.09%     
==========================================
  Files          63       63              
  Lines       11940    11967      +27     
==========================================
+ Hits         8348     8357       +9     
- Misses       2818     2836      +18     
  Partials      774      774              

Impacted Files	Coverage Δ
storage/cache/database.go	59.21% <ø> (ø)
server/rest.go	76.88% <79.16%> (+0.04%)	:arrow_up:
config/config.go	71.86% <100.00%> (+0.23%)	:arrow_up:

... and 2 files with indirect coverage changes

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