Allow running search cluster tests with nidx

[javitonino]

Description

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How was this PR tested?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.94%. Comparing base (bf98cc8) to head (63a0c1b).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2627      +/-   ##
==========================================
- Coverage   85.96%   85.94%   -0.03%     
==========================================
  Files         377      377              
  Lines       23864    23866       +2     
==========================================
- Hits        20515    20511       -4     
- Misses       3349     3355       +6     

Flag	Coverage Δ
nucliadb	73.45% <100.00%> (-0.08%)	⬇️
nucliadb-ingest	28.53% <0.00%> (-0.01%)	⬇️
nucliadb-reader	24.58% <0.00%> (-0.01%)	⬇️
nucliadb-search	37.64% <100.00%> (+0.01%)	⬆️
nucliadb-standalone	46.56% <100.00%> (+<0.01%)	⬆️
nucliadb-train	44.69% <100.00%> (+<0.01%)	⬆️
nucliadb-writer	39.09% <0.00%> (-0.01%)	⬇️
nucliadb_dataset	55.45% <ø> (ø)
nucliadb_models	84.82% <ø> (ø)
nucliadb_sdk	80.11% <ø> (ø)
nucliadb_sidecar	89.03% <ø> (+1.78%)	⬆️
nucliadb_telemetry	86.55% <ø> (ø)
nucliadb_utils	84.36% <ø> (ø)

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