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)

ts/domain/query/aggregation-builder.ts

@@ -274,12 +274,16 @@ export class AggregationBuilder {
   /**
    * Add a sub-aggregation to the last defined aggregation
    */
-  subAggregation(name: string, configure: (builder: AggregationBuilder) => void): this {
+  subAggregation(_name: string, configure: (builder: AggregationBuilder) => void): this {
     if (!this.currentAggName) {
       throw new Error('Cannot add sub-aggregation: no parent aggregation defined');
     }
 
     const parentAgg = this.aggregations[this.currentAggName];
+    if (!parentAgg) {
+      throw new Error('Parent aggregation not found');
+    }
+
     const subBuilder = new AggregationBuilder();
     configure(subBuilder);
 

ts/domain/query/query-builder.ts

@@ -28,8 +28,8 @@ import type { AggregationBuilder } from './aggregation-builder.js';
 import { createAggregationBuilder } from './aggregation-builder.js';
 import { ElasticsearchConnectionManager } from '../../core/connection/connection-manager.js';
 import { defaultLogger } from '../../core/observability/logger.js';
-import { defaultMetrics } from '../../core/observability/metrics.js';
-import { defaultTracing } from '../../core/observability/tracing.js';
+import { defaultMetricsCollector } from '../../core/observability/metrics.js';
+import { defaultTracer } from '../../core/observability/tracing.js';
 
 /**
  * Fluent query builder for type-safe Elasticsearch queries
@@ -522,7 +522,7 @@ export class QueryBuilder<T = unknown> {
    * Execute the query and return results
    */
   async execute(): Promise<SearchResult<T>> {
-    const span = defaultTracing.createSpan('query.execute', {
+    const span = defaultTracer.startSpan('query.execute', {
       'db.system': 'elasticsearch',
       'db.operation': 'search',
       'db.elasticsearch.index': this.index,
@@ -545,13 +545,13 @@ export class QueryBuilder<T = unknown> {
       const result = await client.search<T>({
         index: this.index,
         ...searchOptions,
-      });
+      } as any);
 
       const duration = Date.now() - startTime;
 
       // Record metrics
-      defaultMetrics.requestsTotal.inc({ operation: 'search', index: this.index });
-      defaultMetrics.requestDuration.observe({ operation: 'search', index: this.index }, duration);
+      defaultMetricsCollector.requestsTotal.inc({ operation: 'search', index: this.index });
+      defaultMetricsCollector.requestDuration.observe(duration / 1000, { operation: 'search', index: this.index });
 
       defaultLogger.info('Query executed successfully', {
         index: this.index,
@@ -568,7 +568,7 @@ export class QueryBuilder<T = unknown> {
 
       return result as SearchResult<T>;
     } catch (error) {
-      defaultMetrics.requestErrors.inc({ operation: 'search', index: this.index });
+      defaultMetricsCollector.requestErrors.inc({ operation: 'search', index: this.index });
       defaultLogger.error('Query execution failed', { index: this.index, error: error instanceof Error ? error.message : String(error) });
       span.recordException(error as Error);
       span.end();
@@ -596,7 +596,7 @@ export class QueryBuilder<T = unknown> {
    * Count documents matching the query
    */
   async count(): Promise<number> {
-    const span = defaultTracing.createSpan('query.count', {
+    const span = defaultTracer.startSpan('query.count', {
       'db.system': 'elasticsearch',
       'db.operation': 'count',
       'db.elasticsearch.index': this.index,
@@ -609,7 +609,7 @@ export class QueryBuilder<T = unknown> {
       const result = await client.count({
         index: this.index,
         ...(searchOptions.query && { query: searchOptions.query }),
-      });
+      } as any);
 
       span.end();
       return result.count;

ts/domain/query/types.ts

@@ -116,8 +116,7 @@ export interface TermQuery {
  */
 export interface TermsQuery {
   terms: {
-    [field: string]: Array<string | number | boolean>;
-    boost?: number;
+    [field: string]: Array<string | number | boolean> | number | undefined;
   };
 }