[DOC] Vector Search now supports new advanced setting to improve indexing performance

[VijayanB]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request.
In 2.18 we will be releasing a new advanced setting where users can configure to decide when to build graph. We would like to update this page to add new section

*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.18

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/k-NN#1942