fix article search

[lionelB]

Lionelb fix #936

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@39bd8dd). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #970   +/-   ##
=========================================
  Coverage          ?   83.63%           
=========================================
  Files             ?      193           
  Lines             ?     2011           
  Branches          ?      302           
=========================================
  Hits              ?     1682           
  Misses            ?      286           
  Partials          ?       43

Impacted Files	Coverage Δ
...ail-api/src/server/routes/search/facets.elastic.js	100% <ø> (ø)
...ail-api/src/server/routes/search/search.elastic.js	100% <ø> (ø)

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