├── app.xml, fess.xml          # DI configuration
├── fess_*.xml                 # Feature-specific DI
├── fess_label_*.properties    # UI labels (i18n)
├── fess_message_*.properties  # Validation messages (i18n)
└── fess_indices/              # OpenSearch index mappings

src/main/webapp/WEB-INF/view/  # JSP templates
src/test/java/.../it/          # Integration tests (*Tests.java)
```

## Architecture Patterns

    /** Configuration settings for the search engine */
    protected Map<String, String> settings;

    /** Path to index configuration resources */
    protected String indexConfigPath = "fess_indices";

    /** List of index configuration files to load */
    protected List<String> indexConfigList = new ArrayList<>();

    /** Map of configuration types to their respective configuration files */