[DOC] k-NN Disk Based Feature documentation

[jmazanec15]

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.
For 2.17, we are releasing disk-based k-NN vector search. Details on experience are contained in opensearch-project/k-NN#1779.

We need to enhance the existing k-NN documentation to contain information about the new quantizer support, the new mode and compression level parameters and when to use what.

*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.17

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
High level RFC has all details: opensearch-project/k-NN#1779

[Naarcha-AWS]

Thanks for submitting @jmazanec15!

[jmazanec15]

We're working on it. Will have PR out some time next week.

[Naarcha-AWS]

@jmazanec15: Sounds good! Please link the PR to the issue when you're done.

[jmazanec15]

PR: #8246