BREAKING CHANGE(core): Refactor to v3: introduce modular core/domain architecture, plugin system, observability and strict TypeScript configuration; remove legacy classes

ts/core/index.ts

@@ -0,0 +1,17 @@
+/**
+ * Core infrastructure for Elasticsearch client
+ *
+ * This module provides the foundation layers:
+ * - Configuration management
+ * - Connection pooling and lifecycle
+ * - Error handling and retry logic
+ * - Observability (logging, metrics, tracing)
+ *
+ * @packageDocumentation
+ */
+
+export * from './config/index.js';
+export * from './connection/index.js';
+export * from './errors/index.js';
+export * from './observability/index.js';
+export * from './plugins/index.js';