fix double index encode error

[cangfengzhs]

What type of PR is this?

• bug
• feature

Which issue(s) this PR fixes:

close 3034
（If it is requirement, issue(s) number must be listed.）

What this PR does / why we need it?

Special notes for your reviewer, ex. impact of this fix, etc:

Additional context:

Checklist：

• Documentation affected （If need to modify document, please label it.)
• Incompatible （If it is incompatile, please describle it and label it.）
• Need to cherry pick （If need to cherry pick to some branchs, please label the destination version(s).)
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory

Release notes：

Please confirm whether to reflect in release notes and how to describe:

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[cangfengzhs]

The code modified in this PR has been included in #3196