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/schema/schema-manager.ts

@@ -14,7 +14,6 @@ import type {
   FieldDefinition,
   SchemaMigration,
   MigrationHistoryEntry,
-  MigrationStatus,
   SchemaManagerConfig,
   SchemaValidationResult,
   SchemaDiff,
@@ -144,7 +143,7 @@ export class SchemaManager {
       index,
       ...mapping,
       timeout: `${this.config.timeout}ms`,
-    });
+    } as any);
 
     if (this.config.enableLogging) {
       this.logger.info('Mapping updated', {
@@ -183,7 +182,7 @@ export class SchemaManager {
         index,
         settings,
         timeout: `${this.config.timeout}ms`,
-      });
+      } as any);
     } finally {
       if (requiresClose) {
         await client.indices.open({ index });
@@ -559,7 +558,7 @@ export class SchemaManager {
       template: template.template,
       data_stream: template.data_stream,
       _meta: template._meta,
-    });
+    } as any);
 
     this.stats.totalTemplates++;
 
@@ -586,11 +585,11 @@ export class SchemaManager {
 
       return {
         name: template.name,
-        index_patterns: template.index_template.index_patterns,
+        index_patterns: template.index_template.index_patterns as string[],
         priority: template.index_template.priority,
         version: template.index_template.version,
         composed_of: template.index_template.composed_of,
-        template: template.index_template.template,
+        template: template.index_template.template as IndexTemplate['template'],
         data_stream: template.index_template.data_stream,
         _meta: template.index_template._meta,
       };
@@ -638,7 +637,7 @@ export class SchemaManager {
       template: template.template,
       version: template.version,
       _meta: template._meta,
-    });
+    } as any);
 
     if (this.config.enableLogging) {
       this.logger.info('Component template created/updated', { name: template.name });
@@ -667,7 +666,8 @@ export class SchemaManager {
 
     if (aliases.add) {
       for (const [alias, config] of Object.entries(aliases.add)) {
-        actions.push({ add: { index, alias, ...config } });
+        const configObj = config as Record<string, unknown>;
+        actions.push({ add: { index, alias, ...configObj } });
       }
     }