Implement Marketplace Indexing and Search Service

[am-miracle]

Description:

Create a high-performance indexing and search service for marketplace listings, auctions, and user data.

Requirements:

Implement real-time indexing of blockchain events
Create advanced search functionality with filters
Add recommendation engine for similar assets
Implement analytics and reporting
Create data aggregation for dashboard metrics
Add caching layer for search results

Technical Specifications:

pub struct IndexingService {
    event_processor: EventProcessor,
    search_engine: SearchEngine,
    recommendation_engine: RecommendationEngine,
    analytics_processor: AnalyticsProcessor,
    cache_manager: CacheManager,
}

Acceptance Criteria:

[ ] Real-time blockchain event indexing
[ ] Advanced search with filters
[ ] Recommendation engine
[ ] Analytics and reporting
[ ] Dashboard metrics
[ ] Search result caching
[ ] Performance optimization
[ ] Data consistency checks