enhance: make all index operation async scheduled by tokio

[chyezh]

issue: #37851 related pr: https://github.com/milvus-io/tantivy/pull/3

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.01%. Comparing base (7bbfe86) to head (3547a4f). Report is 13 commits behind head on master.

Additional details and impacted files

[](https://app.codecov.io/gh/milvus-io/milvus/pull/37946?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) ```diff @@ Coverage Diff @@ ## master #37946 +/- ## =========================================== + Coverage 68.87% 81.01% +12.13% =========================================== Files 289 1358 +1069 Lines 25481 190558 +165077 =========================================== + Hits 17551 154375 +136824 - Misses 7930 30689 +22759 - Partials 0 5494 +5494 ``` | [Components](https://app.codecov.io/gh/milvus-io/milvus/pull/37946/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) | Coverage Δ | | |---|---|---| | [Client](https://app.codecov.io/gh/milvus-io/milvus/pull/37946/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) | `72.16% <ø> (∅)` | | | [Core](https://app.codecov.io/gh/milvus-io/milvus/pull/37946/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) | `68.87% <ø> (ø)` | | | [Go](https://app.codecov.io/gh/milvus-io/milvus/pull/37946/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) | `83.17% <ø> (∅)` | | [see 1069 files with indirect coverage changes](https://app.codecov.io/gh/milvus-io/milvus/pull/37946/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io)

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[czs007]

/approve /lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chyezh, czs007

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