fix: remove validateFieldName in dropIndex

[SpadeA-Tang]

issue: https://github.com/milvus-io/milvus/issues/45459

This check is unnecessary when dropping index.

[xiaocai2333]

/lgtm

[xiaocai2333]

/lgtm

[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.
• Additional "ci-v2/*" checkers will run for this PR to ensure the new ci-v2 system is working as expected.
• For tests that exist in both v1 and v2, passing in either system is considered PASS.

To rerun ci-v2 checks, comment with:

• /ci-rerun-code-check // for ci-v2/code-check
• /ci-rerun-build // for ci-v2/build
• /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
• /ci-rerun-e2e-arm // for ci-v2/e2e-arm

If you have any questions or requests, please contact @zhikunyao.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 76.62%. Comparing base (0e1de00) to head (e7c5609). :warning: Report is 33 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #45460      +/-   ##
==========================================
- Coverage   76.66%   76.62%   -0.05%     
==========================================
  Files        1864     1864              
  Lines      290056   290047       -9     
==========================================
- Hits       222384   222260     -124     
- Misses      60331    60420      +89     
- Partials     7341     7367      +26     

Components	Coverage Δ
Client	78.17% <ø> (ø)
Core	83.58% <ø> (ø)
Go	74.64% <ø> (-0.06%)	:arrow_down:

Files with missing lines	Coverage Δ
internal/proxy/task_index.go	73.85% <ø> (+0.43%)	:arrow_up:

... and 27 files with indirect coverage changes

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[mergify[bot]]

@SpadeA-Tang cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[SpadeA-Tang]

/run-cpu-e2e

[mergify[bot]]

@SpadeA-Tang cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[SpadeA-Tang]

/ci-rerun-ut-integration

[SpadeA-Tang]

/run-cpu-e2e

[SpadeA-Tang]

/ci-rerun-ut-integration

[mergify[bot]]

@SpadeA-Tang cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[zhengbuqian]

/run-cpu-e2e

[SpadeA-Tang]

/ci-rerun-ut-integration

[mergify[bot]]

@SpadeA-Tang cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SpadeA-Tang, zhengbuqian

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• ~~internal/proxy/OWNERS~~ [zhengbuqian]
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[xiaocai2333]

/lgtm