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)

IMPLEMENTATION_STATUS.md

@@ -10,6 +10,7 @@ The complete transformation plan is documented in this conversation under "Enter
 ## ✅ Phase 1: Foundation - COMPLETE
 
 ### Directory Structure
+
 - ✅ `ts/core/` - Core infrastructure
 - ✅ `ts/domain/` - Domain APIs
 - ✅ `ts/plugins/` - Plugin architecture
@@ -18,6 +19,7 @@ The complete transformation plan is documented in this conversation under "Enter
 - ✅ `tsconfig.json` - Strict TypeScript configuration
 
 ### Error Handling (ts/core/errors/)
+
 - ✅ `types.ts` - Error codes, context types, retry configuration
 - ✅ `elasticsearch-error.ts` - Complete error hierarchy:
   - ElasticsearchError (base)
@@ -36,6 +38,7 @@ The complete transformation plan is documented in this conversation under "Enter
 - ✅ `index.ts` - Module exports
 
 ### Observability (ts/core/observability/)
+
 - ✅ `logger.ts` - Structured logging:
   - LogLevel enum (DEBUG, INFO, WARN, ERROR)
   - Logger class with context and correlation
@@ -57,6 +60,7 @@ The complete transformation plan is documented in this conversation under "Enter
 - ✅ `index.ts` - Module exports
 
 ### Configuration (ts/core/config/)
+
 - ✅ `types.ts` - Configuration types:
   - AuthConfig (basic, apiKey, bearer, cloud)
   - TLSConfig
@@ -78,6 +82,7 @@ The complete transformation plan is documented in this conversation under "Enter
 - ✅ `index.ts` - Module exports
 
 ### Connection Management (ts/core/connection/)
+
 - ✅ `health-check.ts` - Health monitoring:
   - HealthChecker class
   - Periodic health checks
@@ -102,11 +107,13 @@ The complete transformation plan is documented in this conversation under "Enter
 - ✅ `index.ts` - Module exports
 
 ### Core Index
+
 - ✅ `ts/core/index.ts` - Exports all core modules
 
 ## ✅ Phase 2: Domain APIs - In Progress (85% of Phase 2)
 
 ### Document API (ts/domain/documents/) - COMPLETE ✅
+
 - ✅ `types.ts` - Type definitions
 - ✅ `document-session.ts` - Session management with efficient cleanup
 - ✅ `document-manager.ts` - Main fluent API class:
@@ -123,6 +130,7 @@ The complete transformation plan is documented in this conversation under "Enter
 - ✅ **Example**: Complete working example in `examples/basic/complete-example.ts`
 
 ### Query Builder (ts/domain/query/) - COMPLETE ✅
+
 - ✅ `types.ts` - Complete query DSL type definitions:
   - All query types (match, term, range, bool, etc.)
   - Aggregation types (terms, metrics, histogram, etc.)
@@ -143,18 +151,21 @@ The complete transformation plan is documented in this conversation under "Enter
 - ✅ **Example**: Comprehensive query example in `examples/query/query-builder-example.ts`
 
 ### Logging API (ts/domain/logging/) - NOT STARTED
+
 - ⏳ TODO: Enhanced SmartLog destination
 - ⏳ TODO: Log enrichment
 - ⏳ TODO: Sampling and rate limiting
 - ⏳ TODO: ILM integration
 
 ### Bulk Indexer (ts/domain/bulk/) - NOT STARTED
+
 - ⏳ TODO: Adaptive batching
 - ⏳ TODO: Parallel workers
 - ⏳ TODO: Progress callbacks
 - ⏳ TODO: Stream support
 
 ### KV Store (ts/domain/kv/) - NOT STARTED
+
 - ⏳ TODO: TTL support
 - ⏳ TODO: Caching layer
 - ⏳ TODO: Batch operations
@@ -163,16 +174,19 @@ The complete transformation plan is documented in this conversation under "Enter
 ## ⏸️ Phase 3: Advanced Features - NOT STARTED
 
 ### Plugin Architecture
+
 - ⏳ TODO: Plugin interface
 - ⏳ TODO: Request/response interceptors
 - ⏳ TODO: Built-in plugins (compression, caching, rate-limiting)
 
 ### Transaction Support
+
 - ⏳ TODO: Optimistic locking with versioning
 - ⏳ TODO: Transaction manager
 - ⏳ TODO: Rollback support
 
 ### Schema Management
+
 - ⏳ TODO: Type-safe schema definition
 - ⏳ TODO: Migration support
 - ⏳ TODO: Index template management
@@ -180,18 +194,21 @@ The complete transformation plan is documented in this conversation under "Enter
 ## ⏸️ Phase 4: Testing & Documentation - NOT STARTED
 
 ### Test Suite
+
 - ⏳ TODO: Unit tests for all core modules
 - ⏳ TODO: Integration tests
 - ⏳ TODO: Chaos tests
 - ⏳ TODO: Performance benchmarks
 
 ### Documentation
+
 - ⏳ TODO: API reference (TSDoc)
 - ⏳ TODO: Migration guide (v2 → v3)
 - ⏳ TODO: Usage examples
 - ⏳ TODO: Architecture documentation
 
 ### README
+
 - ⏳ TODO: Update with new API examples
 - ⏳ TODO: Performance benchmarks
 - ⏳ TODO: Migration guide link
@@ -329,6 +346,7 @@ await docs
 ## 🔄 Resumption Instructions
 
 When resuming:
+
 1. Read this status file
 2. Review the complete plan in the original conversation
 3. **Next Priority**: Enhanced Logging API in `ts/domain/logging/`
@@ -346,13 +364,13 @@ When resuming:
    - ILM integration
    - Metric extraction
 
-3. **Bulk Indexer** (`ts/domain/bulk/`)
+2. **Bulk Indexer** (`ts/domain/bulk/`)
    - Adaptive batching logic
    - Parallel workers
    - Progress callbacks
    - Stream support
 
-4. **KV Store** (`ts/domain/kv/`)
+3. **KV Store** (`ts/domain/kv/`)
    - TTL support
    - Caching layer
    - Batch operations