Description

This PR integrates Elasticsearch into the PetChain platform to provide high-performance, full-text search capabilities across pets, vets, and medical records. It moves search logic from basic database queries to a dedicated search engine, enabling advanced features like relevance scoring, geolocation-aware results, and real-time autocomplete.

Related Issues

closes #91

Changes Made - [ ]

• Elasticsearch Client Initialization: Created a singleton client in lib/elasticsearch.ts for efficient connection management.
• Unified Search API: Implemented POST /api/v1/search supporting:
• Relevance Scoring: Multi-match queries with field boosting (e.g., name^3).
• Geolocation: geo_distance filtering based on user coordinates.
• Faceted Search: Aggregations for breed, specialty, and status.

Screenshots (if applicable)

Checklist

• My code follows the project's coding style.
• I have tested these changes locally.
• Documentation has been updated where necessary.