enhance: Execute text indexes for multiple fields concurrently

[xiaocai2333]

issue: #46274

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: xiaocai2333
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[sre-ci-robot]

[ci-v2-notice]
Notice: We are gradually rolling out the new ci-v2 system.

• Legacy CI jobs remain unaffected, you can just ignore ci-v2 if you don't want to run it.
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• /ci-rerun-code-check // for ci-v2/code-check
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• /ci-rerun-ut-integration // for ci-v2/ut-integration
• /ci-rerun-ut-go // for ci-v2/ut-go
• /ci-rerun-ut-cpp // for ci-v2/ut-cpp
• /ci-rerun-ut // for all ci-v2/ut-integration, ci-v2/ut-go, ci-v2/ut-cpp
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[codecov]

Codecov Report

❌ Patch coverage is 36.94268% with 99 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.93%. Comparing base (b2c49d0) to head (95c6c11).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/datanode/index/task_stats.go	21.97%	70 Missing and 1 partial ⚠️
internal/datanode/compactor/sort_compaction.go	28.94%	26 Missing and 1 partial ⚠️
internal/storage/sort.go	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #46279   +/-   ##
=======================================
  Coverage   75.92%   75.93%           
=======================================
  Files        1898     1898           
  Lines      296913   297001   +88     
=======================================
+ Hits       225435   225513   +78     
- Misses      63985    63999   +14     
+ Partials     7493     7489    -4     

Components	Coverage Δ
Client	78.18% <ø> (ø)
Core	82.75% <ø> (ø)
Go	73.92% <36.94%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
internal/datanode/data_node.go	74.53% <ø> (-0.16%)	⬇️
internal/datanode/index_services.go	68.83% <100.00%> (+0.46%)	⬆️
internal/datanode/services.go	54.11% <100.00%> (ø)
internal/storage/sort.go	72.90% <93.33%> (+1.41%)	⬆️
internal/datanode/compactor/sort_compaction.go	58.26% <28.94%> (-0.32%)	⬇️
internal/datanode/index/task_stats.go	51.22% <21.97%> (-1.48%)	⬇️

... and 26 files with indirect coverage changes

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