Remove restriction of caching only 10 % nodes in disk search

[suri-kumkaran]

• Does this PR have a descriptive title that could go in our release notes?
• Does this PR add any new dependencies?
• Does this PR modify any existing APIs?
  • Is the change to the API backwards compatible?
• Should this result in any changes to our documentation, either updating existing docs or adding new ones?

Reference Issues/PRs

What does this implement/fix? Briefly explain your changes.

Remove restriction of caching only 10 % nodes in disk search, instead update the logic to reduce the num_nodes_to_cache to total_nodes when it is more than total_nodes.

Any other comments?

This will make this feature more aligned with Rust implementation.

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