Currently, the searches API lacks a default reranking mechanism. To improve search result relevance, we should add default reranking.

Proposed Changes:

• Implement default reranking for all searches API calls.
• Introduce a parameter (e.g., enable_rerank) to control whether reranking is applied.
  • This parameter should default to True.
  • When True, the system's default reranking model will be used.