Upgrade to Feathers v5 (dove) compatibility with TypeScript

Major changes:
- Convert entire codebase from JavaScript to TypeScript
- Add full Elasticsearch 8.x client compatibility
- Fix all adapter-tests to achieve 100% pass rate (137/137 tests)
- Add Docker setup for testing with Elasticsearch 8.15.0
- Migrate from ESLint legacy config to flat config format

Key fixes:
- Add missing index parameter to all ES operations (get, create, update, patch, remove)
- Fix parent-child document handling with proper routing
- Fix bulk operations for ES8 client response structure
- Implement proper field selection in bulk patch operations
- Handle undefined routing parameters correctly
- Add default parameters to prevent undefined errors

Infrastructure:
- Add docker-compose.yml for local Elasticsearch testing
- Add wait-for-elasticsearch.js script for CI/CD
- Configure TypeScript with ES2018 target and CommonJS modules
- Update all dependencies to stable Feathers v5 versions

Breaking changes:
- Requires @elastic/elasticsearch client v8.x (not v9.x)
- Minimum Node.js version requirement updated
- Some internal API changes for TypeScript compatibility

Author: marshallswain

.eslintignore

@@ -31,3 +31,4 @@ node_modules
 
 dist/
 .nyc_output/
+lib/

.eslintrc.js

@@ -0,0 +1,81 @@
+# Testing feathers-elasticsearch
+
+This project includes comprehensive test coverage using a real Elasticsearch instance via Docker.
+
+## Prerequisites
+
+- Node.js (>= 18.x)
+- Docker and Docker Compose
+- npm or yarn
+
+## Running Tests
+
+### Quick Test (with Docker)
+
+The simplest way to run the full test suite:
+
+```bash
+npm run docker:test
+```
+
+This command will:
+1. Start Elasticsearch in Docker on port 9201
+2. Wait for Elasticsearch to be ready
+3. Run the complete test suite
+4. Clean up the Docker container
+
+### Manual Docker Testing
+
+If you want more control over the testing process:
+
+```bash
+# Start Elasticsearch
+npm run docker:up
+
+# Wait for it to be ready (optional, runs automatically in docker:test)
+npm run docker:wait
+
+# Run tests against the Docker instance
+npm run test:integration
+
+# Clean up when done
+npm run docker:down
+```
+
+### Docker Management
+
+- **Start Elasticsearch**: `npm run docker:up`
+- **Stop and clean up**: `npm run docker:down`
+- **View logs**: `npm run docker:logs`
+- **Wait for readiness**: `npm run docker:wait`
+
+### Environment Variables
+
+- `ES_VERSION`: Elasticsearch version to use (default: 8.15.0)
+- `ELASTICSEARCH_URL`: Elasticsearch connection URL (default: http://localhost:9201)
+
+### Test Configuration
+
+The test suite supports multiple Elasticsearch versions:
+- 5.0.x
+- 6.0.x  
+- 7.0.x
+- 8.0.x (default)
+
+## Test Structure
+
+- `test/` - Main test files using `@feathersjs/adapter-tests`
+- `test-utils/` - Test utilities and schema definitions
+- `test-utils/schema-*.js` - Version-specific Elasticsearch schemas
+
+## Coverage
+
+Test coverage reports are generated with nyc and displayed after test completion.
+
+```bash
+# Run tests with coverage
+npm test
+
+# Run only coverage (after tests)
+npm run coverage
+```

.gitignore

@@ -0,0 +1,26 @@
+version: '3.8'
+
+services:
+  elasticsearch:
+    image: docker.elastic.co/elasticsearch/elasticsearch:8.15.0
+    container_name: feathers-elasticsearch-test
+    environment:
+      - discovery.type=single-node
+      - xpack.security.enabled=false
+      - xpack.security.enrollment.enabled=false
+      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
+    ports:
+      - "9201:9200"
+      - "9301:9300"
+    healthcheck:
+      test: ["CMD-SHELL", "curl -f http://localhost:9200/_cluster/health || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 60s
+    volumes:
+      - elasticsearch_data:/usr/share/elasticsearch/data
+
+volumes:
+  elasticsearch_data:
+    driver: local

TESTING.md

@@ -0,0 +1,54 @@
+/* eslint-env node */
+const js = require('@eslint/js');
+
+module.exports = [
+  {
+    ignores: ['coverage/**', 'lib/**', 'node_modules/**', 'eslint.config.js', 'scripts/**']
+  },
+  js.configs.recommended,
+  {
+    files: ['src/**/*.js'],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: 'module'
+    },
+    rules: {
+      semi: ['error', 'always']
+    }
+  },
+  {
+    files: ['test/**/*.js', 'test-utils/**/*.js'],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: 'commonjs',
+      globals: {
+        require: 'readonly',
+        module: 'writable',
+        exports: 'writable',
+        process: 'readonly',
+        console: 'readonly',
+        Buffer: 'readonly',
+        __dirname: 'readonly',
+        __filename: 'readonly',
+        global: 'writable'
+      }
+    },
+    rules: {
+      semi: ['error', 'always'],
+      'no-unused-vars': ['error', { 'argsIgnorePattern': '^_' }]
+    }
+  },
+  {
+    files: ['test/**/*.js'],
+    languageOptions: {
+      globals: {
+        describe: 'readonly',
+        it: 'readonly',
+        before: 'readonly',
+        after: 'readonly',
+        beforeEach: 'readonly',
+        afterEach: 'readonly'
+      }
+    }
+  }
+];