add remove sample code for tutorial

[vankichi]

Signed-off-by: vankichi [email protected]

Description:

Since #1050 , I added the removing index section for sample codes.
also, updated the doc/tutorial/get-started.md along with above changes.

I already confirmed these sample codes run well in my local environment (docker and k3d).
I appreciate it if you try Get-Started too.

Related Issue:

#1050

How Has This Been Tested?:

Environment:

• Go Version: 1.16
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.3

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

[vdaas-ci]

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[hlts2]

I through the eyes of the user, I thought that CreateIndex would mean deleting the file, so what about the following?. if I made a mistake, I am sorry...

Suggested change

	If you run below code, the indexes will be removed from the Vald Agent and the Backup file.
	If you run below code, the indexes will be removed from the Vald Agent and the Backup file because you deleted all the inserted vectors in the above section.

[hlts2]

btw, Should we change from SaveIndex to SaveAndCreateIndex method.
Will the backup file be erased, but will the indexing data be erased as well? 🤔
I made a mistake, I am sorry...

[vankichi]

@hlts2 @kevindiu
I think CreateAndSaveIndex() won't work well.
cuz, there is no index to create and save.
I just tried to use CreateAndSaveIndex() instead of the current implementation, but end with the error FailedPreCondition desc = CreateAndSaveIndex API failed to create indexes pool_size = 400.
If you can, could you please try it?

[vankichi]

@hlts2 @kevindiu
I should announce to guys that the current vald-agent=ngt:latest image will not work well, so if you'd like to confirm the tutorial, please use the nightly version.
The latest version will be updated when released next version.

And also, CreateAndSaveIndex() is good. but, this time, I'd like to use another method as SaveIndex() instead of this to show vald client does not have only CreateAndSaveIndex().
How do you think about it?

[kevindiu]

LGTM

[hlts2]

LGTM

[kevindiu]

/rebase
/format
/approve

[vdaas-ci]

[REBASE] Rebase triggered by kevindiu for branch: documentation/docs/add-remove-index-sec-for-tutorial

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by kevindiu.

[vdaas-ci]

[APPROVED] This PR is approved by kevindiu.