[Bug]: Improve Performance of "CREATE VECTOR INDEX" on GIST 960

[arjunsk]

Is there an existing issue for the same bug?

• [X] I have checked the existing issues.

Branch Name

main

Commit ID

6003d8346f0fed6e1fbd0563bc7bc2b1d2287741

Other Environment Information

- Hardware parameters:
- OS type:
- Others:

Actual Behavior

Create Index: 14mins (1min for create index, 12mins for mapping) Query: Recall: 0.5461, QPS: 2.8397

Expected Behavior

Create Index : should take at max 5mins Query: Improve the QPS numbers

Steps to Reproduce

1. Run `GIST 960` insert
2. Run QPS code

Additional information