fix(core): Resolve TypeScript strict mode and ES client API compatibility issues for v3.0.0

- Fix ES client v8+ API: use document/doc instead of body for index/update operations
- Add type assertions (as any) for ES client ILM, template, and search APIs
- Fix strict null checks with proper undefined handling (nullish coalescing)
- Fix MetricsCollector interface to match required method signatures
- Fix Logger.error signature compatibility in plugins
- Resolve TermsQuery type index signature conflict
- Remove sourceMap from tsconfig (handled by tsbuild with inlineSourceMap)

readme.hints.md

@@ -5,12 +5,14 @@
 ### Completed Components
 
 **Phase 1: Foundation (100%)** - Complete
+
 - Error handling with typed hierarchy
 - Observability (logging, metrics, tracing)
 - Configuration management with fluent builder
 - Connection management with health checks and circuit breaker
 
 **Phase 2: Domain APIs (100%)** - Complete! 🎉
+
 - **Document API (100%)** - Complete fluent CRUD operations with sessions, iteration, snapshots
 - **Query Builder (100%)** - Type-safe query construction with aggregations
 - **Logging API (100%)** - Enterprise structured logging with:
@@ -43,6 +45,7 @@
   - Example at `ts/examples/kv/kv-store-example.ts`
 
 **Phase 3: Advanced Features (100%)** - Complete!
+
 - **Plugin Architecture (100%)** - Extensible request/response middleware:
   - Plugin lifecycle hooks (beforeRequest, afterResponse, onError)
   - Plugin priority and execution ordering
@@ -99,22 +102,26 @@ const results = await createQuery<Product>('products')
 const stats = await createQuery<Product>('products')
   .matchAll()
   .aggregations((agg) => {
-    agg.terms('brands', 'brand.keyword')
+    agg
+      .terms('brands', 'brand.keyword')
       .subAggregation('avg_price', (sub) => sub.avg('avg_price', 'price'));
   })
   .execute();
 ```
 
 ### Next Priorities (Phase 4)
+
 1. **Comprehensive Test Suite** - Full test coverage for all modules
 2. **Migration Guide** - Guide from v2 to v3 API
 3. **README Update** - Update main README with new v3 API documentation
 
 ### Structure
+
 - Single `ts/` directory (no parallel structures)
 - Single `tsconfig.json` with strict mode enabled
 - All v3.0 code lives in `ts/` directory
 
 ### Known Issues
+
 - Minor TypeScript strict mode import issues documented in `ts/QUICK_FIXES.md`
-- Need to apply `import type` fixes for verbatimModuleSyntax compliance
+- Need to apply `import type` fixes for verbatimModuleSyntax compliance