Fix the problem of not being able to rebuild search index

[JohnNiang]

What type of PR is this?

/kind bug
/area core
/milestone 2.18.x

What this PR does / why we need it:

This PR fixes the problem of not being able to rebuild search index due to null description and updateTimestamp.

Which issue(s) this PR fixes:

Fixes #6317

Does this PR introduce a user-facing change?

修复无法正常刷新搜索引擎的问题

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.31%. Comparing base (bc10336) to head (5f4084b).
Report is 74 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6323      +/-   ##
============================================
+ Coverage     54.51%   58.31%   +3.80%     
- Complexity     3523     3763     +240     
============================================
  Files           646      646              
  Lines         21862    21975     +113     
  Branches       1528     1545      +17     
============================================
+ Hits          11917    12814     +897     
+ Misses         9328     8543     -785     
- Partials        617      618       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ruibaby]

/lgtm

[ruibaby]

/cherrypick release-2.17

[halo-dev-bot]

@ruibaby: once the present PR merges, I will cherry-pick it on top of release-2.17 in a new PR and assign it to you.

In response to this:

/cherrypick release-2.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ruibaby]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [ruibaby]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[halo-dev-bot]

@ruibaby: new pull request created: #6324

In response to this:

/cherrypick release-2.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.