Adding dragon API to build index without any thread.

[fulmicoton]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1496 (d870012) into main (a451f6d) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1496      +/-   ##
==========================================
+ Coverage   94.03%   94.04%   +0.01%     
==========================================
  Files         240      241       +1     
  Lines       44833    44894      +61     
==========================================
+ Hits        42158    42220      +62     
+ Misses       2675     2674       -1     

Impacted Files	Coverage Δ
common/src/writer.rs	94.11% <ø> (ø)
src/core/mod.rs	100.00% <ø> (ø)
src/lib.rs	96.48% <ø> (ø)
src/postings/postings_writer.rs	98.23% <ø> (ø)
src/postings/recorder.rs	98.56% <ø> (ø)
src/core/index.rs	93.15% <100.00%> (+0.37%)	⬆️
src/core/index_simple_writer.rs	100.00% <100.00%> (ø)
src/indexer/segment_updater.rs	95.60% <0.00%> (-0.14%)	⬇️
src/store/index/mod.rs	98.37% <0.00%> (+0.54%)	⬆️
src/fieldnorm/writer.rs	98.48% <0.00%> (+1.51%)	⬆️

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