abandon uppercase letters in fulltext index name

[cangfengzhs]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

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

Checklist:

Tests:

• Unit test(positive and negative cases)
• Function test
• Performance test
• N/A

Affects:

• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes:

abandon uppercase letters in fulltext index name

Please confirm whether to be reflected in release notes and how to describe:

ex. Fixed the bug .....

[Shylock-Hg]

Why add this?

[codecov-commenter]

Codecov Report

Base: 84.72% // Head: 84.70% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (1971aa5) compared to base (a7a0185).
Patch coverage: 33.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4628      +/-   ##
==========================================
- Coverage   84.72%   84.70%   -0.02%     
==========================================
  Files        1358     1358              
  Lines      135642   135651       +9     
==========================================
- Hits       114926   114908      -18     
- Misses      20716    20743      +27     

Impacted Files	Coverage Δ
src/graph/validator/MaintainValidator.cpp	74.77% <0.00%> (-0.86%)	⬇️
src/kvstore/raftex/RaftPart.h	100.00% <ø> (+6.89%)	⬆️
src/storage/admin/AdminProcessor.h	0.00% <ø> (ø)
src/kvstore/Part.cpp	53.55% <50.00%> (ø)
src/kvstore/raftex/RaftPart.cpp	70.11% <100.00%> (-1.08%)	⬇️
src/meta/processors/parts/GetSpaceProcessor.cpp	61.29% <0.00%> (-19.36%)	⬇️
src/storage/exec/IndexNode.cpp	91.66% <0.00%> (-8.34%)	⬇️
src/storage/exec/FilterNode.h	89.47% <0.00%> (-5.27%)	⬇️
...eta/processors/session/SessionManagerProcessor.cpp	73.54% <0.00%> (-4.52%)	⬇️
src/kvstore/raftex/Host.cpp	71.70% <0.00%> (-4.51%)	⬇️
... and 37 more

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[cangfengzhs]

Why add this?

You can refer to the associated issue. ES does not allow index to contain uppercase letters.