FF cleanup: nidx-as-extracted-text-storage

[jotare]

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 85.73%. Comparing base (64a3feb) to head (f612155).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3777      +/-   ##
==========================================
+ Coverage   85.43%   85.73%   +0.29%     
==========================================
  Files         564      565       +1     
  Lines       48850    49801     +951     
  Branches    14351    15291     +940     
==========================================
+ Hits        41736    42697     +961     
+ Misses       6481     6473       -8     
+ Partials      633      631       -2     

Flag	Coverage Δ
nidx	80.90% <ø> (+1.17%)	⬆️
nucliadb	74.16% <ø> (+0.03%)	⬆️
nucliadb-ingest	43.78% <ø> (+<0.01%)	⬆️
nucliadb-reader	43.78% <ø> (+<0.01%)	⬆️
nucliadb-search	55.00% <ø> (+0.04%)	⬆️
nucliadb-standalone	46.13% <ø> (+<0.01%)	⬆️
nucliadb-train	44.76% <ø> (+<0.01%)	⬆️
nucliadb-writer	47.19% <ø> (+0.02%)	⬆️
nucliadb_dataset	72.85% <ø> (+<0.01%)	⬆️
nucliadb_models	69.71% <ø> (+0.01%)	⬆️
nucliadb_sdk	82.28% <ø> (+<0.01%)	⬆️
nucliadb_telemetry	85.67% <ø> (+0.07%)	⬆️
nucliadb_utils	80.86% <ø> (+<0.01%)	⬆️

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